Programmable SIM Cards | Writable IMSI Ki ICCID | 5G 4G LTE | HKCARD – Sysmocom Alternative
HKCARD offers programmable SIM cards with writable IMSI, Ki, ICCID for 5G/4G networks. Sysmocom-compatible (SJA2, SJS1, SJA5), pySim-ready. ISO certified manufacturer with 15+ years experience. Bulk orders available.
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HKCARD Electronics – Leading Manufacturer of Programmable SIM Cards for 5G NR and 4G LTE Networks
Introduction to Professional SIM Card Solutions
HKCARD ELECTRONICS CO., LIMITED is a trusted global supplier 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 custom SIM card solutions for telecommunications operators, IoT developers, network engineers, and research institutions worldwide.
Our commitment to innovation and quality has positioned us as a leading SIM card manufacturer offering alternatives to traditional suppliers like Sysmocom, with superior availability, competitive pricing, and comprehensive technical support.
Comprehensive Range of Writable and Programmable SIM Cards
Advanced Writable Parameter SIM Cards
HKCARD specializes in manufacturing SIM cards with fully customizable parameters, providing unprecedented flexibility for network testing, development, and deployment:
Core Writable Parameters:
- Writable IMSI SIM Cards – International Mobile Subscriber Identity customization
- Writable Ki SIM Cards – Authentication Key programming
- Writable ICCID SIM Cards – Integrated Circuit Card Identifier configuration
- Writable OP or OPc SIM Cards – Operator Variant algorithm support
- Writable KEY SIM Cards – Complete cryptographic control
- Writable SPN SIM Cards – Service Provider Name customization
- Writable MNC SIM Cards – Mobile Network Code flexibility
- Writable MCC SIM Cards – Mobile Country Code programming
These writable IMSI SIM cards free from vendor restrictions empower developers to create custom network configurations without limitations.
Re-Programmable SIM Cards – Not One-Time Burn
Unlike disposable one-time programmable solutions, HKCARD’s re-programmable (not one-time burn) SIM cards support multiple write cycles. This critical feature enables:
✓ Iterative testing and debugging
✓ Parameter adjustment without card replacement
✓ Cost-effective development cycles
✓ Long-term reusability in lab environments
Our cards are programmable SIM cards using PC/SC tools (e.g., pySim), ensuring compatibility with industry-standard programming interfaces and open-source ecosystems.
5G and 4G LTE Technology Leadership
Next-Generation 5G NR SIM Card Solutions
HKCARD leads the industry in programmable SIM card 5G technology:
- Programmable 5G NR 3GPP R16 SA 5G SIM Card – Full standalone architecture support
- 5G SA SIM card – Standalone core network compatibility
- 5G SA 128K SIM – Enhanced storage for 5G applications
- 5G USIM – Universal Subscriber Identity Module for next-gen networks
- SUCI SIM card – Subscription Concealed Identifier for enhanced privacy
Our HKCARD’s Programmable SIM Cards for 5G Networks and custom SIM cards for 4G LTE & 5G NR Networks meet the latest 3GPP Release 16 specifications, ensuring future-proof deployments.
4G LTE and Multi-Mode SIM Solutions
Comprehensive 4G LTE/WCDMA blank cards portfolio includes:
- USIM/LTE SIM Cards (not GSM-only) – Full 4G capabilities
- USIM 4G and USIM LTE variants
- Multi network 4G VoLTE SIM card – Voice over LTE support
- 4G GSM SIM card – Backward compatibility
- 128K USIM, 128KUSIM – Standard storage options
- Half SIMcard LTE trio – Multi-form-factor solutions
IoT and Specialized Applications
- IoT/Evaluation SIM Cards – Optimized for machine-to-machine communication
- SA SIM card – Service Architecture compatibility
- Parking SIM cards – Specialized vertical applications
- 4G VoLTE tester – Network validation tools
Complete Form Factor Coverage
Available Form Factors: 2FF / 3FF / 4FF SIM Cards
HKCARD provides all industry-standard physical formats:
| Form Factor | Common Name | Dimensions | Applications |
|---|---|---|---|
| 2FF | Mini-SIM | 25×15mm | Legacy devices, M2M |
| 3FF | Micro-SIM | 15×12mm | Tablets, older smartphones |
| 4FF | Nano-SIM/Nano-USIM | 12.3×8.8mm | Modern smartphones, 5G devices |
We also offer:
- White SIM card and white SIM cards – Unbranded for OEM/ODM
- Blank SIM cards / blank SIM – Ready for custom programming
- Empty SIM card – Unprogrammed stock
- SIM blank – Manufacturing-ready cards
- Triple-cut combo cards supporting all three sizes
Memory Configurations and Technical Specifications
Storage Capacity Options
HKCARD offers flexible memory configurations to match application requirements:
- 128K SIM – Standard capacity (131,072 bytes)
- 256K SIM – Enhanced storage (262,144 bytes)
- 512K SIM – Premium capacity (524,288 bytes)
Our 128K USIM and 5G SA 128K SIM variants provide optimal balance between storage capacity and cost-effectiveness for modern LTE and 5G deployments.
Advanced Technology Integration
Near Field Communication:
- NFC SIM and SIM card NFC – Contactless payment integration
- SIM wallet NFC – Secure mobile wallet applications
- SIM cards near field communication market solutions
Specialized Card Types:
- Java SIM card and SIM Java – Java Card platform support
- CDMA SIM card / RUIM card – Code Division Multiple Access networks
- UIM card – User Identity Module for specific carriers
- TD SIM – Time Division networks
- Blank eSIM – Embedded SIM solutions
Sysmocom Compatibility – Your Reliable Alternative
Looking for Sysmocom Alternatives? Choose HKCARD’s Programmable Test SIM Cards
Many network engineers and researchers rely on sysmocom SIM card products for development and testing. HKCARD offers form-, function-, and file-system-compatible alternatives with superior advantages:
Compatible Models:
- sysmoISIM-SJA2 (also known as sysmoisim-sja2, SJA2)
- sysmoUSIM-SJS1 (sysmousim-sjs1)
- sysmoISIM-SJA5 (sysmoisim-sja5)
Why Choose HKCARD Over Sysmocom:
✅ Better Availability – Consistent stock levels, no long lead times
✅ Competitive Pricing – 20-30% cost savings on bulk orders
✅ Same Functionality – 100% compatible with existing workflows
✅ Direct Manufacturer – No intermediary markups
✅ Flexible MOQ – Lower minimum order quantities
✅ Global Shipping – Faster delivery to 50+ countries
Compatibility with pySim and Open-Source Tools
HKCARD’s cards integrate seamlessly with industry-standard development environments:
Software Compatibility:
- pySim – Python-based SIM card programming framework
- SIM programming tools via PC/SC interface
- SIM personalize tools for batch configuration
- SIM card creator utilities
Network Stack Integration:
- Open5GS – Open-source 5G Core implementation
- srsRAN – Software Radio Systems LTE/5G stack
- USIM test solution frameworks for R&D labs
- University and research institution testing environments
Our programmable SIM cards use standard ETSI/3GPP file structures, ensuring compatibility with all PC/SC-based sim programming tools.
Manufacturing Excellence and Quality Assurance
ISO-Certified SIM Card Manufacturing
As a premier SIM card manufacturer and SIM card suppliers network, HKCARD maintains:
- ISO 9001:2015 Quality Management Certification
- ETSI TS 102 221 compliance (UICC standards)
- 3GPP TS 31.102 adherence (USIM specifications)
- RoHS and environmental certifications
Wholesale and Bulk Supply Capabilities
HKCARD serves as a trusted SIM cards wholesale supplier offering:
- Bulk SIM orders from 100 to 1,000,000+ units
- SIM card wholesale pricing with volume discounts
- White label MVNO SIM cards with custom branding
- White label SIM cards for resellers and operators
- Offbrand SIM production for niche markets
Industry Applications and Use Cases
Telecommunications and MVNO Services
- White label MVNO SIM cards for virtual network operators
- Custom branding and personalization services
- Multi-country roaming configurations
- VoLTE and Wi-Fi calling enablement
Research and Development
- Dummy SIM card for device development
- SIM dummy for mechanical testing
- Fake SIM for UI/UX prototyping
- USIM test solution for protocol validation
IoT and M2M Deployments
- Smart metering and utility applications
- Fleet management and vehicle tracking
- Industrial automation connectivity
- Asset monitoring solutions
Frequently Asked Questions (FAQ)
Q1: What makes HKCARD’s programmable SIM cards different from standard carrier SIM cards?
A: HKCARD’s programmable SIM cards feature writable IMSI, Ki, ICCID, OP/OPc, and other critical parameters, unlike locked carrier SIM cards. Our re-programmable (not one-time burn) SIM cards allow multiple configurations, making them ideal for testing, development, and custom network deployments. Standard carrier SIMs have fixed parameters that cannot be modified.
Q2: Are HKCARD SIM cards 100% compatible with Sysmocom products?
A: Yes. HKCARD provides direct replacements for sysmoISIM-SJA2, sysmoUSIM-SJS1, and sysmoISIM-SJA5 cards. Our products maintain identical file system structures, APDU command sets, and physical specifications. If you’re currently using sysmocom SIM card products with pySim or PC/SC tools, HKCARD cards will work seamlessly as drop-in replacements with better availability and pricing.
Q3: Can I program HKCARD SIM cards using pySim?
A: Absolutely. All HKCARD programmable SIM cards work with pySim and other PC/SC-based SIM programming tools. Simply use a standard USB smart card reader and follow pySim documentation. Our cards support standard ADM keys and APDU commands used by pySim, making sim programming straightforward.
Q4: What is the difference between 128K, 256K, and 512K SIM cards?
A: The numbers refer to memory storage capacity:
- 128K SIM (131KB) – Standard capacity suitable for most 4G/5G applications
- 256K SIM (262KB) – Enhanced storage for additional apps and data
- 512K SIM (524KB) – Premium capacity for complex applications and multiple applets
For most LTE and 5G networks, 128K USIM cards provide adequate storage while maintaining cost-effectiveness.
Q5: Do you offer SIM cards compatible with both 4G and 5G networks?
A: Yes. Our USIM/LTE SIM Cards (not GSM-only) support both 4G LTE/WCDMA networks and 5G NR deployments. The Programmable 5G NR 3GPP R16 SA 5G SIM Card specifically supports 5G standalone architecture while maintaining backward compatibility with 4G networks. You don’t need separate cards for different network generations.
Q6: What form factors are available, and can I get all three sizes in one card?
A: HKCARD provides 2FF (mini), 3FF (micro), and 4FF (nano-USIM) form factors. We also offer triple-cut combo cards that include all three sizes with breakaway frames, providing maximum flexibility. Simply push out the size you need – no need to order different formats for different devices.
Q7: Can I customize IMSI, MCC, and MNC for my private LTE network?
A: Yes. Our writable IMSI SIM cards, writable MCC SIM cards, and writable MNC SIM cards allow complete customization of these parameters. You can configure any IMSI range, MCC (country code), and MNC (network code) for private LTE/5G networks, test environments, or custom deployments. These writable IMSI SIM cards free you from carrier restrictions.
Q8: Do you support NFC and SIM wallet applications?
A: Yes. HKCARD manufactures NFC SIM cards with integrated near-field communication capabilities. Our SIM wallet NFC solutions support contactless payment applications, mobile banking, and secure authentication. The SIM card NFC variants comply with NFC Forum standards and major payment schemes.
Q9: What is your minimum order quantity for blank SIM cards?
A: As a flexible SIM cards wholesale supplier, we accommodate various order sizes:
- Sample orders: 10-50 pieces
- Small batch: 100-1,000 pieces
- Bulk SIM orders: 1,000-10,000 pieces
- Enterprise/MVNO: 10,000+ pieces with custom pricing
Contact us for volume discounts and white label SIM cards customization.
Q10: How do HKCARD’s SUCI SIM cards enhance privacy in 5G networks?
A: SUCI (Subscription Concealed Identifier) is a 5G security feature that prevents IMSI catchers from intercepting subscriber identity. Our SUCI SIM card implementations encrypt the IMSI before transmission using the home network’s public key, ensuring that only legitimate network elements can decrypt the subscriber identity. This is mandatory for 5G SA deployments and significantly enhances user privacy compared to 4G networks.
Why Global Customers Choose HKCARD
15+ Years of Industry Excellence
Since our establishment, HKCARD ELECTRONICS CO., LIMITED has:
✓ Delivered 50+ million SIM cards to customers in 60+ countries
✓ Partnered with leading telecom operators, MVNOs, and IoT providers
✓ Maintained 99.8% quality approval rating
✓ Achieved <0.02% defect rate through rigorous testing
✓ Provided 24/7 technical support for integration challenges
Competitive Advantages
Technical Excellence:
- In-house R&D team tracking latest 3GPP standards
- Support for emerging technologies (5G SA, SUCI, eSIM)
- Custom firmware and applet development
Supply Chain Reliability:
- Consistent inventory of popular SKUs
- Fast turnaround: 7-15 days for standard orders
- Global logistics partners ensuring timely delivery
Customer-Centric Service:
- Free samples for qualified projects
- Technical documentation in multiple languages
- Pre-sales consultation and post-sales support
- Customization services for OEM/ODM requirements
How to Order Your Programmable SIM Cards
Step 1: Identify Your Requirements
Determine your specifications:
- Network type (4G LTE, 5G NR, or both)
- Form factor (2FF, 3FF, 4FF, or combo)
- Memory capacity (128K, 256K, 512K)
- Quantity and timeline
- Special features (NFC, Java Card, etc.)
Step 2: Request a Quote
Contact HKCARD through:
- Website inquiry form
- Direct email: byronhan@cardmfg.com
- WhatsApp/WeChat :+8615817372512 for instant communication
- Phone consultation with technical team
Step 3: Sample Testing (Optional)
We recommend sample testing before bulk orders:
- Receive 5-10 test cards
- Validate compatibility with your tools and systems
- Verify programming procedures with pySim or your tools
- Confirm network registration and authentication
Step 4: Place Your Order
After approval:
- Finalize specifications and pricing
- Choose customization options (if any)
- Arrange payment terms
- Confirm delivery schedule
Step 5: Receive and Deploy
- Cards arrive pre-tested and quality-checked
- Include programming templates and documentation
- Technical support available during deployment
- Ongoing support for scaling and additional orders
Contact HKCARD – Your Trusted SIM Card Solutions Partner
Ready to experience superior programmable SIM cards with better availability and pricing than traditional suppliers?
HKCARD ELECTRONICS CO., LIMITED
📧 Email:byronhan@cardmfg.com
🌐 Website: https://www.cardmfg.com/
📱 WhatsApp/Wechat: +8615817372512
Our Promise:
- Fast response within 12 hours
- Technical expertise you can trust
- Competitive pricing without compromising quality
- Partnership approach, not just transactions
Whether you need writable IMSI SIM cards, 5G SA SIM cards, or sysmocom alternatives, HKCARD delivers the SIM card solutions that power your innovation.
“Sysmocom SJA2 Alternative: HKCARD’s Cost-Effective Programmable SIM Cards with Full pySim Compatibility”
“Writable IMSI SIM Cards Wholesale: 128K/256K/512K Options for 4G LTE & 5G NR Network Testing”
“5G SA SIM Card Manufacturer: 3GPP R16 Compliant Programmable SUCI SIM Solutions from HKCARD”
“Blank SIM Cards Supplier: Re-Programmable USIM Cards for Open5GS, srsRAN, and IoT Applications”
“White Label MVNO SIM Cards: Custom 4G VoLTE & 5G NR Solutions with NFC and Java Card Support”
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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
Blank white USIM cards from HKCARD Electronics with 128K, 256K, 512K memory options, re-programmable using PC/SC tools for Open5GS and srsRAN network testing and IoT applications
HKCARD ELECTRONICS CO., LIMITED
📧 Email:byronhan@cardmfg.com
🌐 Website: https://www.cardmfg.com/
📱 WhatsApp/Wechat: +8615817372512
