China Reliable sim card supplier.

Payments: L/C, D/P, T/T, Western Union, MoneyGram, Paypal

Delivery: hongkong./shenzhen

Origin:china

Packing: standard export package

Inspection: yes

From a technical standpoint, 4K to 128K might sound minimal, but for SIM cards, it’s actually quite sufficient.

A 4K card (4096 bytes) works fine for basic GSM prepaid services. It stores the essential IMSI, Ki authentication key, phonebook entries, and a limited number of SMS messages. If you only need voice calls and simple 2G/3G data, 4K gets the job done.

32K and 64K cards are the most common configurations today. The extra space accommodates STK menus, value-added service applications, expanded contact lists, and various carrier-specific applets.

128K cards are mainly used when complex STK applications are required – think mobile banking, electronic wallets, or scenarios where operators want to embed numerous service menus directly into the SIM.

Table of Contents

STK Menu Engineering Implementation

STK (SIM Application Toolkit) allows us to run small applications directly on the SIM card. This feature is particularly valuable when creating operator-customized cards.

For example, you can preload a menu system into the SIM that displays options like “Check Balance,” “Buy Data Package,” or “Customer Service Hotline” as soon as users power on their phones. When users select an option, the SIM automatically sends USSD commands or SMS to the operator’s system.

Implementation requires writing instruction sets compliant with 3GPP TS 11.14 standards. Common commands include:

DISPLAY TEXT (show text messages)
SELECT ITEM (menu item selection)
SEND SMS (send text messages)
SET UP CALL (initiate phone calls)
LAUNCH BROWSER (open web browser)

When programming, pay careful attention to EF file structure and access permissions, especially sections involving security authentication.

Technical Differences: Prepaid vs Postpaid

From a SIM card hardware perspective, prepaid and postpaid cards are essentially identical – the difference lies mainly in HLR/HSS system configuration.

However, there are practical deployment considerations:

Prepaid cards typically require more frequent balance checking functionality, so STK menus tend to be more feature-rich. Many prepaid cards come preloaded with recharge code entry, balance inquiry, and package activation functions.

Postpaid cards are relatively simpler since users don’t need constant balance monitoring. But they might include bill inquiry and plan modification features.

From a card programming perspective, ICCID, IMSI, and Ki writing procedures are identical for both types. The difference is only in how the operator’s backend system identifies and processes each card.

GSM Network Compatibility Testing

Our USIM cards support 2G/3G/4G networks. But during actual testing, several key points require attention:

Authentication Algorithms: GSM uses COMP128, UMTS uses Milenage, and LTE also uses Milenage but with potentially different parameters. For a single card to support all networks, you must correctly configure OPc/OP values during programming.
File System: USIM cards use a hierarchical file system (similar to folder structures). GSM EF files and USIM EF files have different paths, but quality cards support both sets.
Voltage Compatibility: Older 2G phones may only support 5V, while newer phones use 3V or 1.8V. Our cards support multi-voltage auto-adaptation.

Custom Printing Technical Requirements

Customers often ask if they can print their own logos and designs. Yes, but there are several technical constraints:

The chip contact area cannot be printed – this 8x8mm zone must maintain conductivity
Print layer thickness must be controlled; excessive thickness affects insertion/removal
Colors use CMYK printing; gold and silver require spot color inks
Card material is PVC or ABS, requiring surface treatment before printing

We use screen printing or offset printing, achieving photo-quality precision. For special materials like transparent or metallic cards, the process is more complex and costs are higher.

Batch Programming and Quality Control

For large-scale production, we use automated card writing equipment that can simultaneously program 32-64 cards at once.

After programming, each card undergoes testing:

Electrical testing (contact conductivity check)
Logic testing (IMSI, Ki data verification)
Authentication testing (simulated network authentication process)
STK functionality testing (if menus are included)

Defective cards are automatically rejected. Our pass rate typically exceeds 99.5%.

If you need millions of cards, we can provide sequential IMSI number ranges, making it convenient for batch account activation in your HLR system.

Real-World Deployment Considerations

When deploying these cards at scale, here are some engineering tips I’ve learned:

Programming speed matters: For a million-card order, even saving 2 seconds per card means days of production time saved. We optimize our programming scripts to write only necessary fields.

IMSI range planning: Work with your operator partner to get a clean IMSI block. Fragmented ranges cause headaches in provisioning systems.

Ki key management: Never store Ki keys in plain text. We use HSM (Hardware Security Module) systems for key generation and secure transfer to operator systems.

STK testing across devices: Not all phones render STK menus the same way. Test your menu on multiple device models – especially budget Android phones which sometimes have quirky implementations.

OTA update capability: Consider including OTA (Over-The-Air) update functionality. This lets you push STK menu updates or fix issues without replacing physical cards.

The beauty of these USIM cards is their flexibility. Whether you’re launching a new MVNO, deploying IoT devices, or running a private network, the same card technology adapts to your specific requirements.

HKCARD Electronics | Blank SIM Cards, GSM Prepaid SIM & Java 128K SIM Card Supplier from China

Finding a Reliable SIM Card Supplier from China Is Harder Than It Looks

Anyone who has spent time sourcing SIM cards from China knows the pattern. You send inquiries to ten suppliers. Eight of them send back a price list within minutes — clearly templated, no technical detail, no indication they actually manufacture anything. One never replies. The tenth asks good questions, understands what you need, and can actually deliver it.

HKCARD ELECTRONICS CO., LIMITED is that tenth supplier.

We have been manufacturing smart cards and SIM cards for over thirteen years. Our production facility is based in China, shipping from both Shenzhen and Hong Kong, and we currently supply telecom operators, mobile network operators, banks, and government agencies across 15 countries and regions worldwide — including markets in Africa, Southeast Asia, the Middle East, and Europe.

This page covers our GSM SIM card product range, what we manufacture, how the order process works, and why the companies that switch to HKCARD tend to stay with us.

SIM Card Product Range

Java 128K SIM Card

The Java 128K SIM card is our most versatile product for operators who need more than basic voice and SMS. Built on the Java Card platform, it supports multiple applets running simultaneously on a single card — mobile banking, loyalty programs, transit ticketing, and operator service menus can all coexist without conflict.

Key specifications:

128K EEPROM storage capacity
Java Card platform — multi-applet support
Compatible with GSM networks
Supports STK (SIM Application Toolkit) menu
OTA (Over-the-Air) update capability
Available as blank/programmable for operator personalization
Also available in CDMA variant
Suitable for prepaid and postpaid deployments
Recharge SIM card functionality supported

The 128K capacity gives operators room to run complex financial service applets without hitting storage constraints — a practical issue that shows up when operators try to squeeze too many services onto 32K or 64K cards.

Native 64K SIM Card

For operators running standard voice, SMS, and basic data services with a straightforward STK menu, the Native 64K SIM card hits the right balance between capability and cost.

Key specifications:

64K EEPROM storage
GSM network compatible
STK menu support for operator value-added services
Available as blank/programmable
CDMA variant available
Prepaid SIM card configuration supported
Suitable for high-volume MNO and MVNO deployments

The 64K format is the workhorse of emerging market operator deployments — reliable, cost-effective, and proven across hundreds of millions of deployed units globally.

Blank GSM Prepaid SIM Card

Sometimes the requirement is simple: a clean, unpersonalized SIM card ready for operator-side provisioning. Our blank GSM prepaid SIM cards ship without any subscriber data loaded, allowing operators and MVNOs to handle personalization in-house or through their own SIM personalization bureau.

Available configurations:

Blank SIM card — no IMSI, ICCID, or Ki pre-loaded
Prepaid SIM card — configured for prepaid billing platform integration
Phone SIM card — standard GSM subscriber identity format
Compatible with GSM network infrastructure
Available in Mini (2FF), Micro (3FF), and Nano (4FF) form factors

Full Mobile SIM Card Product Family

Beyond the core products above, HKCARD manufactures a complete range of GSM SIM cards covering every major use case in the market today.

STK SIM Card — 16K / 32K / 64K / 128K / 256K

SIM Application Toolkit is the engine behind operator value-added services. Every time a subscriber accesses a mobile banking menu, checks their airtime balance through a SIM menu, or uses an operator loyalty service — that is STK running on the card.

HKCARD STK SIM cards support:

Standard GSM voice and data services
Mobile banking — transfers, balance inquiry, bill payment
Mobile stock trading — real-time portfolio access
Airtime recharge and subscription management
Operator-branded service menus with custom menu text and structure
Available from 16K for basic menus up to 256K for complex multi-service platforms

OTA SIM Card — 32K / 64K / 128K / 256K

Over-the-Air management is how operators maintain their SIM card estate without asking subscribers to visit a store. Push new applets, update parameters, fix configuration issues, add services — all remotely, over the existing cellular network.

HKCARD OTA SIM cards support:

OTA1 / OTA2 / OTA3 — China Mobile specifications
ETSI 03.48 — international standard for OTA secure channel
RFM (Remote File Management) — read and update SIM files remotely
RAM (Remote Applet Management) — install, update, and delete Java applets OTA
DSM (Data Security Management) — secure credential management

For any operator running more than a few thousand subscribers, OTA capability is not optional. It is the difference between managing your network and being managed by it.

WIB SIM Card — 32K / 64K / 128K / 256K

Wireless Internet Browser (WIB 1.3) pre-loaded on the SIM card gives subscribers on basic handsets access to internet content without requiring a smartphone. In markets where feature phones remain dominant, WIB still delivers real value to subscribers who would otherwise have no browsing capability.

Java Based SIM Card — 64K / 128K / 256K

Built on the Java Card platform, these SIM cards support dynamic applet installation and management — giving operators the flexibility to evolve their service offering over time without reissuing physical cards. New services get pushed to existing cards via OTA.

S@T SIM Card — 32K / 64K / 128K / 256K

SIM Alliance Toolbox (S@T) provides a structured application framework that extends STK with more consistent behavior across heterogeneous handset populations. Operators who need predictable service delivery across a wide range of device types — common in emerging markets — find S@T valuable.

Celltick SIM Card — 32K / 64K / 128K / 256K

Celltick enables broadcast-based content delivery to SIM cards via cell broadcast channels. News, sports scores, emergency alerts, and operator promotions reach subscribers — including those on basic handsets — without requiring an internet connection on the device.

HC SIM (High Capacity SIM) — 512MB / 1GB and above

The HC SIM is a different category entirely. Where standard SIM cards store authentication credentials and small application data, HC SIM cards provide 512MB to 1GB or more of onboard storage — enough for high-quality audio and video files, MMS content, and multimedia applications.

High-quality audio and video storage
MMS content management
USB interface support for direct data access
Suitable for multimedia-capable feature phones and specialized connected devices

Standards and Certifications

HKCARD SIM cards are manufactured in compliance with:

Technical Standards:

ISO 7816
GSM 11.11
GSM 11.12
GSM 11.14
GSM 03.48
OTA1/2/3 (China Mobile specification)
Carrier-specific specifications accommodated on request

Industry Certifications:

GSM SAS — SIM card security certification
EAL 5+ — Common Criteria security evaluation
SIMalliance membership and compliance
Java Card License
VISA and MasterCard certification
ISO quality management certification

These are not checkbox certifications. EAL 5+ in particular requires rigorous independent security evaluation — it is the standard that banks and government identity programs require before they will consider a SIM card supplier.

Payment Terms and Logistics

We understand that international procurement requires flexibility on payment and shipping terms. HKCARD accommodates:

Payment Methods:

L/C (Letter of Credit) — for large orders requiring bank guarantee
D/P (Documents against Payment) — documentary collection
T/T (Telegraphic Transfer / Wire Transfer) — most common for established customers
Western Union — for smaller orders
MoneyGram — international money transfer
PayPal — for sample and small quantity orders

Shipping:

Origin: China
Departure: Shenzhen or Hong Kong (customer’s choice based on logistics requirements)
Packing: Standard export packaging with inspection
Pre-shipment inspection available

Lead Times:

Sample cards: 5 to 7 business days
Mass production: Confirmed at order stage based on quantity and specification

How an Order Works — From First Inquiry to Delivery

We have refined this process over thirteen years. It is designed to catch problems early — before they become expensive.

Step 1 — Inquiry and Quotation
Send us your technical requirements and quantity. We respond with a detailed quotation. If the price needs discussion, we negotiate until we reach an agreement that works for both sides.

Step 2 — Technical Samples
Before any money changes hands beyond a sample fee, we prepare test cards based on your technical specification. You receive physical cards to evaluate. If something is not right, we correct it before moving forward.

Step 3 — Sample Testing and Confirmation
You test the sample cards against your network or test equipment. If they pass, we proceed. If there are issues, we address them. This step exists specifically to catch compatibility problems before mass production.

Step 4 — Artwork and Printing Proof
You provide your card artwork. We convert it into a production-ready printing proof and send it back for your approval. What you approve is what gets printed.

Step 5 — Pre-Production Sample
We produce a small batch of cards using the approved printing proof. You confirm the physical print quality before mass production begins.

Step 6 — Order Placement and Production
You place the confirmed order and arrange the deposit. Upon receipt, we begin mass production. You have a confirmed production timeline before we start.

Step 7 — Delivery
We ship according to the agreed trade terms. Documentation provided as required for import clearance.

This process takes longer than clicking “add to cart” and entering a credit card number. It also means you receive exactly what you ordered, working correctly, with no surprises.

Why Companies Choose HKCARD

We have been asked this question enough times that we have a straightforward answer.

13 Years of Specialized Manufacturing
We have been doing this since before some of our current customers were founded. The institutional knowledge that comes from thirteen years of SIM card manufacturing is not something a newer entrant can replicate quickly.

Government-Appointed Supplier
HKCARD is an appointed supplier for Chinese government programs covering banking, telecommunications, and social identity cards. Government procurement standards are demanding. Meeting them consistently for over a decade means something.

Proprietary OS and Application Technology
We develop our own card operating system and applications. This matters when an operator has a non-standard requirement — we can modify at the OS level, not just the application level. Most SIM card trading companies cannot do this because they do not own the underlying technology.

Production Scale
Our production capacity is 9 to 12 million cards per month. The facility uses high-speed automated equipment imported from Germany, Japan, and the United States. This scale means we can handle both large commercial orders and maintain quality control simultaneously.

15 Countries and Regions Served
Our international customer base spans Africa, Southeast Asia, the Middle East, Eastern Europe, and beyond. We understand the regulatory, technical, and logistical requirements that differ between markets.

24/7 Support
Not a claim we make lightly. Our service network operates across time zones, which matters when you have a network issue at 2am and need a SIM-related answer before your morning shift starts.

Long-Term After-Sales Commitment
We provide on-site technical guidance upon request. If something goes wrong after deployment, we do not disappear. We have customer relationships that have continued for over ten years — that does not happen without genuine after-sales follow-through.

Frequently Asked Questions

What is the difference between a blank SIM card and a prepaid SIM card?
A blank SIM card has no subscriber data loaded — no IMSI, no Ki, no ICCID. It is ready for operator-side personalization. A prepaid SIM card is personalized with subscriber credentials and configured for a prepaid billing platform. We supply both.

Can you manufacture CDMA SIM cards as well as GSM?
Yes. Our Java 128K and Native 64K SIM cards are available in both GSM and CDMA variants.

What is the minimum order quantity?
This depends on the product and configuration. Contact us with your requirement and we will give you a direct answer.

Do you supply SIM cards for African telecom operators?
Yes. Africa is a significant market for us. We have experience with the regulatory requirements, preferred frequency bands, and logistical considerations specific to African MNO deployments.

Can you handle the full personalization process including IMSI and Ki loading?
Yes. We offer complete SIM card personalization services — IMSI, ICCID, Ki, SPN, and all related parameters — loaded in our secure facility before shipment.

What certifications do your SIM cards carry?
GSM SAS, EAL 5+, SIMalliance compliance, Java Card License, VISA, MasterCard, and ISO. Specific certification documentation available upon request.

How do I get started?
Send us your technical requirements, target network, quantity, and any customization needs. We will respond with a quotation and next steps.

Contact HKCARD ELECTRONICS CO., LIMITED

Thirteen years in this industry has taught us that the best customer relationships start with a direct, honest conversation. Tell us what you need. We will tell you whether we can deliver it, at what price, and on what timeline.

📱 Phone / WhatsApp / WeChat: +86 158 1737 2512

Email:byronhan@cardmfg.com
💬 Skype: byron1681
🌐 Website: www.cardmfg.com

JAVA 128K SIM card support Programmable Blank SIM card /CDMA SIM Card /Recharge SIM Card

Native 64K SIM card gsm SIM card support Programmable Blank SIM card /CDMA SIM Card /prepaid SIM Card

Blank Mobile Phone SIM Card,GSM Prepaid SIM Card blank SIM card
1.blank sim card
2.prepaid sim card
3.phone sim card
4.applicable to GSM network

Mobile SIM Card
SIM card is applicable to GSM network. In addition to the primary voice and data services, it offers STK menu and supports various value-added applications, which can be updated by OTA download.

Product family	Product	Card Capacity	Product Profile
SIM Card	STK	16K/32K/64K/128K/256K	In addition to the primary voice and data services, various STK value-added financial services are available such as mobile bank, mobile stock, etc.
	OTA	32K/64K/128K/256K	Supporting OTA1/2/3, ETSI03.48; various brands of service can be available by means of OTA download
	WIB	32K/64K/128K/256K	WIB1.3 mini browser preloaded, wireless access to the Internet
	Java Based SIM	64K/128K/256K	Based on Java Card platform
	S@T	32K/64K/128K/256K	Based on S@T specification
	Celltick	32K/64K/128K/256K	Based on Celltick specification
	HC SIM	512M/1G↑	High Capacity SIM card that allows subscribers to store high quality audio and video, supporting MMS/USB

Standards Applied
ISO 7816
GSM 11.11
GSM 11.12
GSM 11.14
GSM 03.48
OTA1/2/3 Specification (specified by China Mobile)
Other Specifications by carriers

HKCARD ELECTRONICS CO.,LIMITED
Phone /whatsapp/wechat +8615817372512
Skype:byron1681
website: https://www.cardmfg.com