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Programmable SIM Cards | Writable IMSI Ki ICCID | 5G/4G LTE | HKCARD – Sysmocom Alternative

HKCARD Electronics offers programmable SIM cards with writable IMSI, Ki, ICCID for 5G/4G networks. Sysmocom-compatible (SJA2/SJS1), pySim-ready, re-programmable. ISO certified manufacturer with 15+ years experience.

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HKCARD Electronics – Leading Manufacturer of Programmable SIM Cards for Modern Networks

Welcome to HKCARD ELECTRONICS CO., LIMITED, your trusted partner in the mobile phone sim cards industry. With over 15 years of proven expertise, we specialize in manufacturing programmable sim cards, writable IMSI SIM cards, and comprehensive sim card solutions for telecommunications operators, MVNOs, IoT developers, and research institutions worldwide.

Revolutionary Writable and Re-Programmable SIM Card Technology

Complete Control with Writable Parameters

HKCARD’s innovative SIM cards provide unprecedented flexibility through fully customizable network parameters:

Essential Writable Features:

Writable IMSI SIM Cards – Customize International Mobile Subscriber Identity
Writable Ki SIM Cards – Program authentication keys securely
Writable ICCID SIM Cards – Define unique card identifiers
Writable OP or OPc SIM Cards – Configure operator authentication algorithms
Writable KEY SIM Cards – Full cryptographic control
Writable SPN SIM Cards – Customize Service Provider Names
Writable MNC SIM Cards – Set Mobile Network Codes
Writable MCC SIM Cards – Define Mobile Country Codes

Our writable imsi sim cards free developers from vendor restrictions, enabling complete network customization.

Re-Programmable Architecture for Maximum Value

Unlike one-time programmable cards, HKCARD’s re-programmable (not one-time burn) SIM cards support multiple write cycles. These cards are fully programmable using PC/SC tools (e.g., pySim), ensuring seamless integration with standard development environments.

Advanced 5G and 4G LTE Network Solutions

Next-Generation 5G NR Technology

HKCARD leads innovation in programmable SIM card 5G technology:

Programmable 5G NR 3GPP R16 SA 5G SIM Card – Full standalone support
Custom SIM cards for 4G LTE & 5G NR Networks – Tailored solutions
HKCARD’s Programmable SIM Cards for 5G Networks – Industry-leading performance
5G SA 128K SIM and 5G SA sim card – Optimized for 5G applications
SUCI SIM card – Enhanced privacy with concealed identity

Comprehensive 4G LTE Portfolio

Our USIM / LTE SIM Cards (not GSM-only) deliver superior performance:

4G LTE/WCDMA blank cards – Multi-mode operation
IoT/Evaluation SIM Cards – Specialized for testing
Multi network 4g volte sim card – VoLTE enabled
USIM 4G, 128K USIM, USIMLTE variants
4G GSM SIM card – Backward compatible

Looking for Sysmocom Alternatives? Choose HKCARD’s Programmable Test SIM Cards

Perfect Sysmocom Compatibility

Many customers search for sysmocom SIM card / sysmocom SIM cards. HKCARD provides 100% compatible alternatives:

Direct Replacements for:

sysmoISIM-SJA2 (sysmoisim-sja2, SJA2)
sysmoUSIM-SJS1 (sysmousim-sjs1)
sysmoISIM-SJA5 (sysmoisim-sja5)

Seamless Integration with Development Tools

HKCARD cards work perfectly with:

pySim and PC/SC-based sim programming tools
Open5GS, srsRAN open-source stacks
USIM test solution environments
SIM personalize tools for batch configuration
SIM card creator applications

If you’re currently using sysmocom sim products, HKCARD offers better availability and competitive pricing.

Comprehensive Form Factors and Variants

Available Form Factors: 2FF / 3FF / 4FF SIM Cards

Form Factor	Type	Applications
2FF	Mini-SIM	Legacy devices
3FF	Micro-SIM	Tablets, older phones
4FF	Nano-USIM	Modern smartphones

Physical Variants and Special Types

White sim card / white sims – Unbranded for customization
Blank sim cards / blank sim / sim blank – Ready for programming
Empty sim card – Unprogrammed stock
Dummy sim card / sim dummy / fake sim – Testing purposes
NFC SIM / sim card nfc / sim wallet nfc – Contactless payments
Java sim card / sim java – Applet support
CDMA sim card / RUIM card / UIM card – CDMA networks
Blank eSIM – Embedded solutions
TD SIM – Time Division networks

Memory Options and Storage Configurations

HKCARD offers flexible storage capacities:

128K SIM / 128K USIM / 128KUSIM – Standard capacity
256K SIM – Enhanced storage
512K SIM – Premium capacity
5G SA 128K SIM – Optimized for 5G

Our simcard half lte and half simcard lte trio provide versatile form factor options.

Manufacturing Excellence and Supply Chain

Industry-Leading Quality Standards

As a premier sim card manufacturer and sim card suppliers network:

ISO 9001:2015 certified
ETSI/3GPP compliant
<0.02% defect rate
99.8% customer satisfaction

Wholesale and Bulk Supply

HKCARD serves as trusted sim cards wholesale supplier:

Bulk sim orders from 100 to 1M+ units
SIM card wholesale volume pricing
White label mvno sim cards – Custom branding
White label sim cards – Reseller programs
Offbrand sim production capabilities

Specialized Applications and Solutions

Parking sim cards – Smart city applications
4G volte tester – Network validation
SIM card solutions – Custom development
Custom sim card – Tailored specifications
SIM programming services
USIM test solution – Lab environments

Frequently Asked Questions

Q1: What makes HKCARD’s programmable SIM cards unique?

A: Our cards feature writable IMSI, Ki, ICCID, OP/OPc parameters and are re-programmable (not one-time burn), supporting multiple write cycles for testing and development.

Q2: Are HKCARD cards compatible with Sysmocom products?

A: Yes, we offer 100% compatible alternatives to sysmoISIM-SJA2, sysmoUSIM-SJS1, and sysmoISIM-SJA5 with better availability and pricing.

Q3: Can I use pySim to program HKCARD SIM cards?

A: Absolutely. All our programmable SIM cards work seamlessly with pySim and other PC/SC tools using standard smart card readers.

Q4: What’s the difference between 128K, 256K, and 512K SIM cards?

A: These indicate storage capacity. 128K SIM (131KB) suits most applications, 256K (262KB) offers enhanced storage, and 512K (524KB) provides premium capacity for complex applications.

Q5: Do your cards support both 4G and 5G networks?

A: Yes, our USIM/LTE SIM cards support 4G LTE, 5G NR, WCDMA, and GSM networks with full backward compatibility.

Q6: What form factors are available?

A: We provide 2FF (Mini), 3FF (Micro), 4FF (Nano-SIM), and triple-cut combo cards supporting all three sizes.

Q7: Can I customize IMSI for private networks?

A: Yes, our writable IMSI SIM cards allow complete customization of IMSI, MCC, and MNC for private LTE/5G networks.

Q8: Do you offer NFC-enabled SIM cards?

A: Yes, we manufacture NFC SIM cards supporting contactless payments, transit cards, and secure authentication.

Q9: What’s your minimum order quantity?

A: We accommodate all project sizes: samples (10-50 pieces), small batch (100-1,000), and bulk orders (1,000+) with volume discounts.

Q10: How do SUCI SIM cards enhance 5G security?

A: SUCI (Subscription Concealed Identifier) encrypts the IMSI before transmission, preventing interception and enhancing privacy in 5G SA networks.

Why Choose HKCARD Electronics

15+ Years of Excellence

✅ Delivered 50M+ SIM cards globally
✅ 60+ countries served
✅ 24/7 technical support
✅ ISO certified manufacturing
✅ Direct manufacturer pricing

Competitive Advantages

Better availability than Sysmocom
20-35% cost savings
Fast 7-15 day turnaround
Free samples for qualified projects
Custom OEM/ODM services

Contact HKCARD Today

Ready to experience superior programmable SIM cards? Contact

HKCARD ELECTRONICS CO., LIMITED

📧 Email:byronhan@cardmfg.com

🌐 Website: https://www.cardmfg.com/
📱 WhatsApp/Wechat: +8615817372512

Whether you need writable IMSI SIM cards, 5G SA SIM cards, or sysmocom alternatives, HKCARD delivers the solutions that power your innovation.

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: “HKCARD programmable SIM cards in 2FF, 3FF, and 4FF form factors showing writable IMSI, Ki, ICCID parameters compatible with pySim and sysmocom alternatives for 5G NR and 4G LTE networks”

2: “Blank white USIM cards from HKCARD Electronics with 128K, 256K, 512K memory options, re-programmable using PC/SC tools for Open5GS, srsRAN, and IoT test solutions”