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Programmable & Writable SIM Cards Supplier | HKCARD Electronics

HKCARD Electronics – trusted manufacturer of programmable SIM cards, writable IMSI/Ki/ICCID SIM cards for 4G LTE & 5G NR networks. Bulk orders welcome. Contact us today.

https://www.cardmfg.com/programmable-writable-sim-cards-supplier

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HKCARD programmable writable IMSI Ki ICCID SIM cards for 4G LTE and 5G NR networks in 2FF 3FF 4FF form factors

Whether you are building a private LTE network, deploying an MVNO, developing IoT devices, or running lab tests for 5G Standalone infrastructure, one component sits at the heart of every mobile connection: the SIM card. But not just any SIM card — you need a programmable, re-writable, carrier-grade USIM that gives you full control over every authentication parameter.

That is exactly what HKCARD ELECTRONICS CO., LIMITED has been delivering for over 15 years.

As a specialized SIM card manufacturer and SIM cards wholesale supplier, HKCARD provides writable IMSI SIM cards, writable Ki SIM cards, writable ICCID SIM cards, writable OP/OPc SIM cards, and a full portfolio of custom SIM cards for 4G LTE & 5G NR networks — all re-programmable (not one-time burn), and all compatible with industry-standard PC/SC tools like pySim.

Who Is HKCARD Electronics?

HKCARD ELECTRONICS CO., LIMITED is a Hong Kong–based company with deep roots in the mobile phone SIM cards industry. For more than a decade, we have served telecom operators, MVNOs, system integrators, IoT developers, university research labs, and government agencies across six continents.

Why customers choose HKCARD:

• ✅ 15+ years of SIM card manufacturing and personalization expertise
• ✅ Full range of 128K, 256K, and 512K USIM cards
• ✅ Re-programmable cards — write, erase, and re-write unlimited times
• ✅ Support for 4G LTE, VoLTE, WCDMA, CDMA, and 5G NR SA/NSA
• ✅ Compatible with pySim, sysmocom tools, and other PC/SC readers
• ✅ Available in 2FF, 3FF, 4FF, and trio-cut form factors
• ✅ Bulk SIM supply and white-label MVNO SIM cards with custom branding
• ✅ Worldwide shipping with fast turnaround

Writable SIM Cards — Full Parameter Control at Your Fingertips

The defining feature of HKCARD’s product line is full writability. Unlike locked, operator-issued SIM cards, our cards let you program every critical field:

 Writable IMSI SIM Cards

The International Mobile Subscriber Identity (IMSI) is the unique number that identifies a subscriber on a mobile network. HKCARD’s writable IMSI SIM cards let you set, change, and re-set the IMSI as many times as needed — a critical capability for private network deployment, roaming tests, and MVNO provisioning. Many customers search for writable IMSI SIM cards free tools — HKCARD provides compatible open-source tool guidance at no extra cost.

Writable Ki SIM Cards

The Ki (Authentication Key) is the secret cryptographic key stored on the SIM that authenticates the subscriber to the network. HKCARD provides writable Ki SIM cards where the Ki can be programmed via secure PC/SC interfaces, giving operators and researchers full control over authentication.

Writable ICCID SIM Cards

The ICCID (Integrated Circuit Card Identifier) is the SIM card’s unique serial number. With HKCARD’s writable ICCID SIM cards, this value can be customized per card — essential for inventory management, MVNO branding, and regulatory compliance.

 Writable OP / OPc SIM Cards

OP (Operator Key) and OPc (Operator Key Derived) are used in USIM authentication algorithms (Milenage). HKCARD’s writable OP or OPc SIM cards let you program these values directly, enabling seamless integration with your HLR/HSS.

Writable KEY, SPN, MNC, and MCC SIM Cards

Beyond the core parameters, HKCARD SIM cards also support:

• Writable KEY SIM Cards — full transport key and ADM key customization
• Writable SPN SIM Cards — set the Service Provider Name displayed on handsets
• Writable MNC SIM Cards — program the Mobile Network Code
• Writable MCC SIM Cards — program the Mobile Country Code

This level of control makes HKCARD’s cards the most versatile programmable SIM cards on the market.

Re-Programmable SIM Cards — Not One-Time Burn

Many SIM cards sold online are one-time programmable (OTP) — once written, they cannot be changed. HKCARD takes a fundamentally different approach.

All HKCARD SIM cards are re-programmable (not one-time burn) SIM cards. You can:

1. Write initial parameters (IMSI, Ki, OPc, ICCID, MCC, MNC, SPN)
2. Test on your network
3. Erase and reprogram with new values
4. Repeat — unlimited cycles

This makes them perfect for R&D labs, QA testing, field trials, and iterative MVNO deployment.

 Programmable SIM Cards Using PC/SC Tools (pySim & More)

HKCARD’s cards are engineered for compatibility with the tools engineers already use:

• pySim (open-source Python tool for SIM programming)
• sysmocom SIM card ecosystem tools
• GRSIMWrite, SIM Personalize Tools, and other commercial solutions
• Any standard PC/SC smart card reader

No proprietary software lock-in. No hidden fees. Just plug in a reader, launch your tool, and start programming.

Tip: HKCARD provides detailed programming guides and technical support to help first-time users get started quickly.

 USIM / LTE SIM Cards — Beyond GSM-Only

HKCARD does not sell outdated GSM-only SIM cards. Every card in our catalog is a USIM / LTE SIM card built on modern Java Card platforms, supporting:

• 4G LTE (FDD and TDD)
• VoLTE (Voice over LTE)
• WCDMA / 3G
• CDMA (CDMA SIM card / RUIM card / UIM card)
• 5G NR (both NSA and SA modes)

Whether you need a 4G GSM SIM card for backward compatibility or a cutting-edge 5G SA 128K SIM, HKCARD has you covered.

 5G-Ready Programmable SIM Cards — SA, NSA, SUCI, and 3GPP R16

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HKCARD 5G SA programmable SIM card supporting SUCI privacy 3GPP R16 for standalone networks

5G is here, and HKCARD is at the forefront.

 Programmable 5G NR 3GPP R16 SA 5G SIM Card

HKCARD’s programmable SIM card 5G lineup supports the latest 3GPP Release 16 standards for 5G Standalone (SA) networks. Key features include:

• SUCI (Subscription Concealed Identifier) support — the privacy mechanism mandated by 5G SA that encrypts the SUPI/IMSI over the air (SUCI SIM card)
• 5G AKA authentication
• 256-bit key support
• AUSF/UDM compatibility
• Available in 128K, 256K, and 512K memory variants (5G SA 128K SIM, 5G SA SIM card)

Custom SIM Cards for 4G LTE & 5G NR Networks

HKCARD works directly with operators and integrators to deliver custom SIM cards tailored to specific network configurations. Whether you’re deploying CBRS private LTE, 5G NR millimeter wave, or multi-network 4G VoLTE SIM card solutions, we program your cards to your exact specifications.

 HKCARD’s Programmable SIM Cards for 5G Networks

Our 5G USIM cards are already deployed in:

• Commercial 5G SA/NSA networks
• Private enterprise 5G networks
• Smart factory and Industry 4.0 projects
• Connected vehicle (V2X) platforms
• 5G research labs at leading universities

 IoT & Evaluation SIM Cards

The Internet of Things demands SIM cards that are small, durable, and remotely manageable. HKCARD’s IoT/Evaluation SIM cards are designed for:

• Smart meters and utility monitoring
• Asset tracking and fleet management
• Wearables and health devices
• Agricultural sensors and environmental monitoring
• Edge computing gateways
• Parking SIM cards for smart parking systems

Available as 4G LTE/WCDMA blank cards ready for your custom provisioning, or pre-programmed to your network’s specifications.

Available Form Factors: 2FF / 3FF / 4FF and Trio-Cut

Every HKCARD SIM card is available in the form factor you need:

Need a dummy SIM card for display or testing? HKCARD also supplies SIM dummy and fake SIM cards for retail display and device testing purposes.

Blank SIM Cards, White SIM Cards & White-Label MVNO Solutions

HKCARD is one of the world’s most experienced blank SIM card suppliers. Our product range includes:

• Blank SIM cards — unprogrammed, ready for personalization
• White SIM cards / White SIMs — unbranded cards for custom deployment
• White-label MVNO SIM cards — fully brandable with your logo, colors, and packaging
• Blank SIM card Airtel-compatible and other operator-specific formats
• Offbrand SIM cards for resellers and distributors
• Blank eSIM solutions for next-generation embedded SIM applications
• Empty SIM card stock for large-scale provisioning

Whether you need 100 pieces for a pilot project or bulk SIM orders of 100,000+ units, HKCARD delivers with consistent quality and competitive pricing.

Java Card Platform & NFC SIM Solutions

All HKCARD SIM cards are built on a Java SIM card (SIM Java) platform, enabling:

• Custom applet development and loading
• OTA (Over-the-Air) management
• Multi-application support
• NFC SIM (SIM card NFC) functionality for contactless payments, transit, and access control
• SIM wallet NFC solutions for mobile payment ecosystems
• Support for the growing SIM cards near field communication market

 Compatibility with sysmocom & Industry Ecosystem

Engineers and researchers familiar with the sysmocom ecosystem will find HKCARD cards to be a high-quality, cost-effective alternative. Our cards are functionally compatible with:

• sysmoISIM-SJA2 (SJA2)
• sysmoISIM-SJA5
• sysmoUSIM-SJS1
• sysmocom SIM cards

Same open-standard compliance. Same tool compatibility. Competitive pricing and flexible MOQs.

 SIM Card Solutions for Every Industry

HKCARD provides end-to-end SIM card solutions across multiple verticals:

 SIM Programming & SIM Personalize Tools

HKCARD doesn’t just sell SIM cards — we provide complete SIM programming support:

• SIM personalize tools recommendations and setup guides
• SIM card creator workflows for batch provisioning
• USIM test solution configurations for lab environments
• 4G VoLTE tester SIM card setups
• TD SIM configurations for TD-LTE/TD-SCDMA networks
• Technical documentation for SIM programming best practices

 Why HKCARD Is the Preferred SIM Card Supplier

When you compare SIM card suppliers worldwide, HKCARD stands apart:

How to Order from HKCARD Electronics

Getting started is simple:

1. Tell us your requirements — network type (4G/5G), form factor, memory size, quantity
2. Receive a quote — typically within 24 hours
3. Sample order — test our cards on your network
4. Bulk order — scale up with confidence
5. Ongoing support — technical assistance throughout your deployment

HKCARD ELECTRONICS CO.,LIMITED
Whatsapp/wechat:+8615817372512
Skype/Teams：byron1681
Email：byronhan@cardmfg.com

Frequently Asked Questions (FAQ)

Q1: What are writable IMSI SIM cards?

A: Writable IMSI SIM cards are SIM cards where the International Mobile Subscriber Identity (IMSI) can be programmed and re-programmed by the user using PC/SC tools such as pySim. HKCARD’s writable IMSI SIM cards support unlimited re-writes and are ideal for network testing, MVNO deployment, and private LTE/5G networks.

 Q2: Does HKCARD offer 5G SA programmable SIM cards?

A: Yes. HKCARD provides Programmable 5G NR 3GPP R16 SA SIM Cards with full SUCI support, 5G AKA authentication, and 128K/256K/512K memory options. These cards are deployed in commercial and private 5G SA networks worldwide.

 Q3: Can I write Ki, OP, OPc, ICCID, MCC, MNC, and SPN to these cards?

A: Absolutely. Every HKCARD programmable SIM card supports writable Ki, OP/OPc, ICCID, KEY, MCC, MNC, and SPN fields. All parameters can be written, erased, and re-written multiple times.

Q4: What form factors are available?

A: HKCARD SIM cards come in 2FF (Mini), 3FF (Micro), 4FF (Nano/Nano-USIM), and trio-cut (half SIM card LTE trio) formats that snap to any size.

 Q5: Are these cards compatible with pySim and sysmocom tools?

A: Yes. HKCARD cards work seamlessly with pySim, sysmocom SIM tools, GRSIMWrite, and any standard PC/SC smart card reader. They are compatible alternatives to sysmoISIM-SJA2, sysmoISIM-SJA5, and sysmoUSIM-SJS1.

 Q6: What is the difference between one-time-burn and re-programmable SIM cards?

A: One-time-burn (OTP) SIM cards can only be programmed once and cannot be changed afterward. HKCARD’s re-programmable (not one-time burn) SIM cards can be written, erased, and reprogrammed unlimited times — saving cost and enabling iterative testing.

 Q7: Does HKCARD supply blank SIM cards in bulk?

A: Yes. HKCARD is a major bulk SIM supplier and SIM card manufacturer offering blank SIM cards, white SIM cards, empty SIM cards, and white-label MVNO SIM cards in quantities from 100 to 1,000,000+ units.

Q8: Do you support CDMA and RUIM cards?

A: Yes. HKCARD supplies CDMA SIM cards, RUIM cards, and UIM cards for CDMA2000 networks, fully programmable with standard tools.

Q9: Can these SIM cards be used for NFC applications?

A: Yes. HKCARD offers NFC SIM cards and SIM wallet NFC solutions for contactless payment, transit, access control, and other SIM cards near field communication market applications.

Q10: Does HKCARD offer blank eSIM solutions?

A: Yes. HKCARD provides blank eSIM solutions for embedded SIM applications, supporting remote provisioning and OTA management for IoT and consumer devices.

 Q11: What memory sizes are available?

A: HKCARD offers 128K SIM, 128K USIM, 256K SIM, and 512K SIM cards. The 128K USIM is our most popular option for 4G LTE deployments, while 256K and 512K variants are recommended for 5G SA and multi-application environments.

 Q12: What is a SUCI SIM card?

A: A SUCI SIM card supports the Subscription Concealed Identifier feature defined by 3GPP for 5G SA networks. SUCI encrypts the subscriber’s permanent identity (SUPI) over the radio interface, enhancing privacy. HKCARD’s 5G SIM cards fully support SUCI computation on-card.

1. “Top 10 Reasons to Choose HKCARD for Bulk Programmable SIM Cards in 2025”
2. “How to Program a Writable IMSI/Ki SIM Card Using pySim — Step-by-Step Guide”
3. “HKCARD vs. Sysmocom SIM Cards: Features, Pricing, and Compatibility Compared”
4. “The Complete Guide to 5G SA SIM Cards with SUCI Support for Private Networks”
5. “White-Label MVNO SIM Cards: How HKCARD Helps You Launch Your Own Mobile Brand”

Summary — Your Trusted Partner in SIM Card Solutions

HKCARD ELECTRONICS CO., LIMITED is more than a SIM card manufacturer — we are your end-to-end partner in mobile connectivity. From writable IMSI SIM cards to programmable 5G NR SIM cards, from blank SIM cards to white-label MVNO solutions, from NFC SIM to IoT evaluation SIM cards, we deliver the quality, flexibility, and technical expertise that your project demands.

15+ years. Millions of cards shipped. Customers in 80+ countries.

📩 Ready to get started? Contact HKCARD Electronics today for a free quote.

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