HKCARD ELECTRONICS CO., LIMITED (HKCARD) is a globally recognized manufacturer specializing in writable, re-programmable SIM cards for 4G LTE and 5G NR networks. With over 15 years of expertise, we provide Sysmocom-compatible, pySim-ready SIM solutions that empower telecom operators, MVNOs, IoT developers, research institutions, and laboratories with full control over network identity parameters.
Our programmable SIM cards support critical fields like IMSI, Ki, ICCID, OP/OPc, and more, making them ideal for private network deployments, testing, prototyping, and custom telecom applications.
1. Why Choose HKCARD for Programmable SIM Cards?
For over 15 years, HKCARD ELECTRONICS CO., LIMITED has been a trusted name in the smart card industry. We combine ISO-certified manufacturing with deep technical expertise to deliver re-programmable SIM cards that offer:
- Full Parameter Control: Write and rewrite IMSI, Ki, ICCID, OP/OPc, MCC/MNC, SPN, and other essential fields.
- Open-Standard Compatibility: Seamless integration with pySim, Sysmocom tools (sysmoISIM-SJA2, sysmoUSIM-SJS1), Open5GS, srsRAN, and other PC/SC-based software.
- Future-Proof Technology: Support for 5G NR (SA/NSA), 4G LTE, VoLTE, and legacy 2G/3G networks.
- Scalable Supply: From single-unit blank SIM cards for labs to massive bulk SIM card orders for enterprise rollouts.
- Form Factor Flexibility: Available in 2FF (Standard), 3FF (Micro), 4FF (Nano), and 3-in-1 triple-cut formats.
2. Our Range of Writable & Re-Programmable SIM Cards
A. Core Programmable SIM Card Families
- Writable IMSI SIM Cards: Customize the International Mobile Subscriber Identity for test networks or private PLMNs.
- Writable Ki SIM Cards: Securely program the authentication key (Ki) for network access control.
- Writable ICCID SIM Cards: Define the unique Integrated Circuit Card Identifier for inventory and subscriber management.
- Writable OP/OPc SIM Cards: Configure Operator Variant or Operator Code parameters for algorithm compatibility.
- Writable MCC/MNC SIM Cards: Set Mobile Country Code and Mobile Network Code to define your network identity.
- Writable SPN SIM Cards: Program the Service Provider Name displayed on user devices.
B. Network Technology Focus
- 5G NR SIM Cards (3GPP R16 SA/NSA):
- Programmable 5G NR SA SIM Cards with SUCI (Subscription Concealed Identifier) support for privacy.
- 5G NSA (Non-Standalone) compatible SIMs for LTE-Anchor deployments.
- 4G LTE / USIM Cards:
- 128K/256K/512K USIM Cards with VoLTE support.
- Multi-network 4G LTE/WCDMA blank cards for global carrier testing.
- Legacy & Specialized:
- 2G GSM SIM Cards (COMP128 algorithm support).
- CDMA/EVDO RUIM/UIM Cards for CDMA networks.
- Java Card SIMs for custom applet deployment.
C. Physical Form Factors & Special Types
- Standard Form Factors: 2FF (Standard), 3FF (Micro), 4FF (Nano-USIM).
- 3-in-1 Triple-Cut Cards: One card fits all device types—snap out to the required size.
- White SIM Cards / White Label SIM Cards: Unbranded or custom-branded cards for MVNOs and enterprises.
- Blank SIM Cards / Empty SIM Cards: Completely unprogrammed cards for full customer personalization.
- Dummy/Engineering SIM Cards: For device testing without network registration.
- MFF2 Chip SIMs: Solderable modules for embedded IoT applications.
- NFC SIM Cards: With secure element for contactless payments and identity.
3. Sysmocom & Open-Source Ecosystem Compatibility
HKCARD is a leading Sysmocom alternative, providing drop-in compatible replacements for:
- sysmoISIM-SJA2 (sysmoisim-sja2)
- sysmoUSIM-SJS1 (sysmousim-sjs1)
- sysmoISIM-SJA5 (sysmoisim-sja5)
Our SIMs are engineered to match Sysmocom’s form factor, file system structure, and functional behavior. They work flawlessly with:
- pySim: The open-source SIM programming toolset.
- PC/SC Interface: Standard smart card reader compatibility.
- Open-Source Core Networks: Open5GS, srsRAN, Magma, OpenAirInterface (OAI).
- Lab & University Testbeds: Widely used in academic and R&D environments for LTE/5G protocol development.
Advantages over Sysmocom cards: Better availability, shorter lead times, globally competitive pricing, and direct manufacturer support.
4. Technical Specifications & Quality Assurance
- Chip Memory: 128K, 256K, 512K EEPROM options.
- Algorithms: Milenage (3GPP), COMP128-1/2/3, CAVE (CDMA), and custom algorithm support.
- Operating System: Native COS or Java Card 3.0.1 Classic for applets.
- Certifications: ISO 7816, ISO 14443 (for contactless variants), CE, FCC, RoHS.
- Manufacturing: ISO 9001:2015 and ETSI/3GPP compliant processes.
- Security: Secure key injection, anti-cloning protection, and tamper-resistant design.
5. Applications & Target Users
- Telecom Operators & MVNOs: For white label SIM card programs, test fleets, and custom network branding.
- IoT & M2M Developers: Programmable SIMs for device authentication in private networks.
- Research Labs & Universities: Essential tools for Open5GS, srsRAN, and 5G protocol research.
- Network Equipment Manufacturers (NEMs): For integration testing and device certification.
- Private/Enterprise Network Operators: Deploying campus 4G/5G networks with full identity control.
- Security Researchers: For penetration testing and security validation of cellular protocols.
6. Frequently Asked Questions (FAQ)
Q1: Can I rewrite IMSI, Ki, and OP values multiple times on HKCARD SIMs?
A: Yes. Our re-programmable SIM cards (not one-time programmable) allow safe, multiple rewrites using standard tools like pySim, perfect for development and testing cycles.
Q2: Are HKCARD SIMs fully compatible with Sysmocom tools like sysmoISIM-SJA2?
A: Absolutely. They are designed as form-factor and functional equivalents. They work with pySim and all PC/SC-based Sysmocom software without modification.
Q3: What form factors do you supply?
A: We supply 2FF (Standard), 3FF (Micro), 4FF (Nano), and popular 3-in-1 triple-cut combo cards. We also offer MFF2 chip modules for soldering.
Q4: Do you support 5G Standalone (SA) networks?
A: Yes. Our Programmable 5G NR R16 SA SIM Cards fully support SUCI encryption and standalone core network authentication.
Q5: What memory sizes are available?
A: Standard options are 128K, 256K, and 512K, selected based on your applet and file system requirements.
Q6: Can I order completely blank SIM cards?
A: Yes. We supply blank SIM cards and white SIM cards with no pre-loaded data, giving you full personalization control.
Q7: Which software can program HKCARD SIM cards?
A: Our cards work with pySim, SIM Personalize Tools, Sysmocom tools, and any standard PC/SC-compliant programming software.
Q8: Do you offer NFC-enabled SIM cards?
A: Yes. We provide NFC SIM cards with secure elements for contactless payment and digital identity applications.
Q9: What is the minimum order quantity (MOQ)?
A: The standard MOQ for testing is ~100 units. Volume discounts start at 1,000+ units. We accommodate pilot projects.
Q10: Are your SIM cards used in academic and research settings?
A: Yes, extensively. They are a popular choice for Open5GS, srsRAN, and university R&D labs worldwide for LTE/5G evaluation and prototyping.
7. Why Partner with HKCARD ELECTRONICS CO., LIMITED?
✅ 15+ Years of Specialized Experience: Deep expertise in programmable and custom SIM card manufacturing.
✅ True Sysmocom Compatibility: Drop-in replacements for sysmoISIM/SJS1 series with proven interoperability.
✅ Re-Programmable & Flexible: Not one-time burn; supports multiple write cycles for development agility.
✅ Fast Lead Times & OEM Branding: Responsive production and white label services for your brand.
✅ Dedicated Technical Support: Expert assistance for Open5GS/srsRAN setup, pySim usage, and integration.
✅ Global Supply Chain: Reliable bulk shipments to over 60 countries for telecom carriers and OEMs.
Contact HKCARD ELECTRONICS CO., LIMITED
Ready to power your 4G/5G, IoT, or research project with reliable, writable SIM cards?
HKCARD ELECTRONICS CO., LIMITED
📧 Email: byronhan@cardmfg.com
🌐 Website: https://www.cardmfg.com/
📱 WhatsApp / WeChat: +86 158 1737 2512
Contact us for:
- Product samples and datasheets
- Technical consultation on Sysmocom/pySim compatibility
- Quotes for blank SIM cards, white label SIMs, or bulk programmable SIM orders
- Custom programming and personalization services
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HKCARD ELECTRONICS CO., LIMITED – Your global source for re-programmable, Sysmocom-compatible, and future-ready SIM card solutions for 4G LTE, 5G NR, and beyond.
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