HKCARD: Programmable SIM Cards | Writable IMSI, Ki, ICCID | 5G/4G LTE | Sysmocom Alternative
Trusted manufacturer of programmable SIM cards with writable IMSI, Ki, ICCID parameters. Compatible with pySim, Sysmocom (SJA2, SJS1, SJA5), Open5GS. Re-programmable 5G NR & 4G LTE solutions. 15+ years expertise. ISO certified.
programmable-sim-cards-5g-lte-solutions
HKCARD Electronics – Your Trusted Global Supplier of Programmable SIM Cards
Introduction to Advanced SIM Card Solutions
Welcome to HKCARD ELECTRONICS CO., LIMITED, a pioneering force in the mobile phone sim cards industry with over 15 years of proven excellence. As a leading sim card manufacturer and trusted sim card suppliers network, we deliver cutting-edge programmable sim cards, writable IMSI SIM cards, and comprehensive sim card solutions to telecommunications operators, MVNOs, IoT developers, research laboratories, and network engineers worldwide.
Our commitment to innovation, quality, and customer success has positioned HKCARD as the preferred sysmocom alternative for organizations seeking reliable, cost-effective, and fully compatible programmable SIM solutions.
Comprehensive Portfolio of Writable and Programmable SIM Cards
Full-Control Writable Parameter SIM Cards
HKCARD specializes in manufacturing SIM cards where every critical network parameter can be customized to your exact specifications. Our writable IMSI sim cards free you from carrier restrictions and vendor lock-in, providing unprecedented flexibility:
Core Writable Parameters:
- Writable IMSI SIM Cards – Customize International Mobile Subscriber Identity for any network
- Writable Ki SIM Cards – Program authentication keys with full cryptographic control
- Writable ICCID SIM Cards – Define unique Integrated Circuit Card Identifiers
- Writable OP or OPc SIM Cards – Configure Operator Variant algorithms (both OP and OPc modes)
- Writable KEY SIM Cards – Complete control over encryption and authentication keys
- Writable SPN SIM Cards – Set custom Service Provider Names displayed on devices
- Writable MNC SIM Cards – Define Mobile Network Code for network identification
- Writable MCC SIM Cards – Specify Mobile Country Code for international roaming
These fully customizable cards enable private network deployments, laboratory testing, network protocol development, and specialized telecommunications applications.
Re-Programmable SIM Cards – Not One-Time Burn
Unlike disposable one-time programmable cards, HKCARD’s re-programmable (not one-time burn) SIM cards support multiple write and erase cycles. This critical feature delivers:
✓ Cost-effective iterative testing – No need to purchase new cards for each configuration change
✓ Sustainable development workflows – Reuse cards throughout product lifecycle
✓ Flexible parameter adjustment – Update network settings without hardware replacement
✓ Long-term laboratory reliability – Perfect for academic and research institutions
Our cards are fully programmable using PC/SC tools (e.g., pySim), ensuring seamless integration with industry-standard development environments.
Next-Generation 5G NR and 4G LTE Technology Leadership
H3: Advanced Programmable 5G SIM Card Solutions
HKCARD leads the industry in programmable SIM card 5G technology, offering state-of-the-art solutions for next-generation networks:
5G NR Product Line:
- Programmable 5G NR 3GPP R16 SA 5G SIM Card – Full standalone architecture support with Release 16 compliance
- 5G SA SIM card – Optimized for standalone core network deployments
- 5G SA 128K SIM – Enhanced storage capacity for 5G applications and network slicing
- 5G USIM – Universal Subscriber Identity Module for multi-generation compatibility
- SUCI SIM card – Subscription Concealed Identifier for enhanced privacy and security
Our HKCARD’s Programmable SIM Cards for 5G Networks and custom SIM cards for 4G LTE & 5G NR Networks meet the latest 3GPP specifications, ensuring your infrastructure is ready for the future of mobile communications.
Comprehensive 4G LTE and USIM Solutions
HKCARD’s 4G/LTE Portfolio:
- USIM / LTE SIM Cards (not GSM-only) – Full 4G capabilities with backward compatibility
- 4G LTE/WCDMA blank cards – Multi-mode operation supporting global frequency bands
- USIM 4G and USIM LTE variants – Certified for major carrier networks
- Multi network 4g volte sim card – Voice over LTE with HD calling support
- 4G GSM SIM card – Dual-mode GSM/LTE functionality
- 128K USIM / 128KUSIM – Standard storage for most applications
- Simcard half LTE and half simcard lte trio – Multi-form-factor solutions
IoT and Specialized Application Cards
- IoT/Evaluation SIM Cards – Optimized for machine-to-machine communication and sensor networks
- SA SIM card – Service Architecture compatibility for advanced features
- Parking SIM cards – Specialized solutions for smart city and parking management
- 4G VoLTE tester – Quality assurance and network validation tools
- TD SIM – Time Division network compatibility
Universal Form Factor Compatibility
Available Form Factors: 2FF / 3FF / 4FF SIM Cards
HKCARD provides SIM cards in all industry-standard physical formats to ensure universal device compatibility:
| Form Factor | Common Name | Dimensions | Typical Applications |
|---|---|---|---|
| 2FF | Mini-SIM | 25 × 15 mm | Legacy devices, M2M modules, industrial equipment |
| 3FF | Micro-SIM | 15 × 12 mm | Tablets, older smartphones, IoT gateways |
| 4FF | Nano-SIM (Nano-USIM) | 12.3 × 8.8 mm | Modern smartphones, 5G devices, wearables |
Additional Physical Options:
- White SIM card / White SIM cards – Unbranded surfaces for OEM customization
- Blank SIM cards / Blank SIM / SIM blank – Ready for custom programming
- Empty SIM card – Unprogrammed factory cards
- Dummy SIM card / SIM dummy – Mechanical testing and device development
- Fake SIM – Engineering samples for UI/UX prototyping
- Triple-cut combo cards supporting all three form factors in one card
Memory Configurations and Advanced Technologies
Flexible Storage Capacity Options
HKCARD offers multiple memory configurations to match your application requirements:
- 128K SIM – Standard capacity (131,072 bytes) suitable for most 4G/5G deployments
- 256K SIM – Enhanced storage (262,144 bytes) for additional applets and data
- 512K SIM – Premium capacity (524,288 bytes) for complex applications
Our 128K USIM and 5G SA 128K SIM variants provide optimal balance between storage capacity, cost-effectiveness, and performance for modern LTE and 5G networks.
Advanced Technology Integration
Near Field Communication Solutions:
- NFC SIM and SIM card NFC – Integrated contactless payment capabilities
- SIM wallet NFC – Secure mobile wallet applications for financial services
- SIM cards near field communication market – Solutions for retail and transit
Specialized Card Technologies:
- Java SIM card / SIM Java – Java Card platform 2.2.1+ support for applet development
- CDMA SIM card / RUIM card – Code Division Multiple Access network compatibility
- UIM card – User Identity Module for specific carrier requirements
- Blank eSIM – Embedded SIM solutions for IoT and connected devices
Sysmocom Compatibility – Your Reliable Alternative
Looking for Sysmocom Alternatives? Choose HKCARD’s Programmable Test SIM Cards
Many network engineers, researchers, and developers rely on sysmocom SIM card products for development and testing. HKCARD offers form-, function-, and file-system-compatible alternatives with superior advantages.
Compatible with Popular Sysmocom Models:
- sysmoISIM-SJA2 (also referenced as sysmoisim-sja2 or SJA2)
- sysmoUSIM-SJS1 (also known as sysmousim-sjs1)
- sysmoISIM-SJA5 (also called sysmoisim-sja5)
Why Choose HKCARD Over Sysmocom:
✅ Superior Availability – Consistent inventory with no extended lead times
✅ Competitive Pricing – 20-35% cost savings on equivalent functionality
✅ Identical Compatibility – 100% compatible with existing workflows and tools
✅ Direct Manufacturer – No distributor markups or middleman delays
✅ Flexible Minimum Orders – Lower MOQ requirements for small projects
✅ Global Logistics – Expedited shipping to 60+ countries
✅ Technical Support – Dedicated engineering assistance for integration
Seamless Integration with pySim and Open-Source Tools
HKCARD’s programmable SIM cards integrate perfectly with industry-standard development environments:
Software Tool Compatibility:
- pySim – Python-based SIM card programming framework (full support)
- SIM programming tools – All PC/SC-compatible readers and software
- SIM personalize tools – Batch configuration and mass deployment utilities
- SIM card creator – Custom profile generation applications
Network Stack Integration:
- Open5GS – Open-source 5G Core and EPC implementation
- srsRAN – Software Radio Systems LTE/5G NR stack
- USIM test solution – Laboratory testing frameworks and validation suites
- University and research institution development platforms
Our cards use standard ETSI/3GPP file structures and ADM key architectures, ensuring compatibility with all PC/SC-based sim programming tools.
Manufacturing Excellence and Quality Assurance
ISO-Certified Production Standards
As a premier SIM card manufacturer, HKCARD maintains the highest quality standards:
- ISO 9001:2015 Quality Management System certification
- ETSI TS 102 221 compliance (UICC-terminal interface specifications)
- 3GPP TS 31.102 adherence (USIM application characteristics)
- RoHS and environmental compliance certifications
- Continuous quality monitoring with <0.02% defect rate
Wholesale and Bulk Supply Capabilities
HKCARD serves as a trusted sim cards wholesale supplier with global reach:
- Bulk SIM orders from 100 to 1,000,000+ units
- SIM card wholesale pricing with volume-based discounts
- White label MVNO SIM cards with custom branding and printing
- White label SIM cards for resellers, MVNOs, and operators
- Offbrand SIM production for niche markets and specialized applications
Industry Applications and Use Cases
Telecommunications and MVNO Services
- White label MVNO SIM cards – Complete turnkey solutions for virtual operators
- Custom branding, logo printing, and carrier profile configuration
- Multi-country roaming profiles and wholesale rate optimization
- VoLTE and Wi-Fi calling enablement services
Research and Development
- Dummy SIM card / dummy sim card airtel – Device development and testing
- SIM dummy – Mechanical fit testing and industrial design validation
- Fake SIM – User interface and experience prototyping
- USIM test solution – Protocol compliance and network interoperability testing
IoT and M2M Deployments
- Smart metering and utility infrastructure
- Fleet management and vehicle telematics
- Industrial automation and remote monitoring
- Asset tracking and supply chain logistics
Frequently Asked Questions (FAQ)
Q1: What makes HKCARD’s programmable SIM cards different from standard carrier SIM cards?
Answer: HKCARD’s programmable SIM cards feature fully writable parameters including IMSI, Ki, ICCID, OP/OPc, MCC, MNC, and SPN, unlike locked carrier SIM cards with fixed values. Our re-programmable (not one-time burn) SIM cards allow multiple configuration cycles, making them ideal for testing, development, private networks, and custom deployments. Standard carrier SIMs cannot be modified after initial programming.
Q2: Are HKCARD SIM cards 100% compatible with Sysmocom products like SJA2?
Answer: Yes, absolutely. HKCARD provides direct drop-in replacements for sysmoISIM-SJA2, sysmoUSIM-SJS1, and sysmoISIM-SJA5 cards. Our products maintain identical file system structures, APDU command sets, ADM key architectures, and physical specifications. If you currently use sysmocom SIM card products with pySim or other PC/SC tools, HKCARD cards will function seamlessly with improved availability and pricing.
Q3: Can I program HKCARD SIM cards using pySim and standard card readers?
Answer: Yes. All HKCARD programmable SIM cards work perfectly with pySim and other PC/SC-based SIM programming tools. Simply use any standard USB smart card reader (compatible with PC/SC protocol) and follow pySim documentation. Our cards support all standard ADM keys and APDU commands, making SIM programming straightforward for developers.
Q4: What is the difference between 128K, 256K, and 512K SIM card memory?
Answer: The numbers indicate storage capacity:
- 128K SIM (131,072 bytes) – Standard capacity suitable for most 4G/5G applications, phonebook storage, and basic applets
- 256K SIM (262,144 bytes) – Enhanced storage for multiple Java Card applets, extended phonebook, and additional data
- 512K SIM (524,288 bytes) – Premium capacity for complex multi-applet environments and extensive data storage
For most modern LTE and 5G NR deployments, 128K USIM cards provide optimal balance between functionality and cost.
Q5: Do HKCARD SIM cards support both 4G and 5G networks?
Answer: 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 full backward compatibility with 4G LTE, 3G WCDMA, and 2G GSM networks. You don’t need separate cards for different network generations.
Q6: What form factors are available, and can I get combo cards?
Answer: HKCARD provides all standard form factors: 2FF (mini-SIM), 3FF (micro-SIM), and 4FF (nano-SIM/nano-USIM). We also offer popular triple-cut combo cards (also called half simcard lte trio) that include all three sizes with perforated breakaway frames. Simply push out the size you need for maximum device compatibility.
Q7: Can I customize IMSI, MCC, and MNC for my private LTE/5G network?
Answer: Absolutely. 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, laboratory test environments, or custom telecommunications deployments. These writable IMSI sim cards free you from traditional carrier restrictions.
Q8: Do you offer NFC-enabled SIM cards for payment applications?
Answer: Yes. HKCARD manufactures NFC SIM cards with integrated near-field communication capabilities. Our SIM wallet NFC solutions support contactless payment applications, mobile banking, transit cards, and secure authentication. The SIM card NFC variants comply with ISO/IEC 14443 standards and support major payment schemes (EMVCo, Visa payWave, Mastercard PayPass).
Q9: What is your minimum order quantity for blank SIM cards?
Answer: As a flexible SIM cards wholesale supplier, we accommodate projects of all sizes:
- Sample/Evaluation orders: 10-50 pieces for testing
- Small batch production: 100-1,000 pieces
- Bulk SIM orders: 1,000-10,000+ pieces with volume pricing
- Enterprise/MVNO deployments: 10,000-1,000,000+ pieces with custom pricing and technical support
Contact our sales team for SIM card wholesale volume discounts and white label SIM cards customization options.
Q10: How do HKCARD’s SUCI SIM cards enhance privacy in 5G networks?
Answer: SUCI (Subscription Concealed Identifier) is a 5G security enhancement that prevents IMSI catchers and unauthorized interception. Our SUCI SIM card implementations encrypt the subscriber identity (IMSI) using the home network’s public key before transmission. Only legitimate network elements with the corresponding private key can decrypt the identity. This is mandatory for 5G SA deployments and significantly enhances user privacy compared to 4G networks where IMSI is transmitted in clear text.
Why Global Customers Trust HKCARD
15+ Years of Industry Leadership
Since our establishment, HKCARD ELECTRONICS CO., LIMITED has achieved:
✓ Delivered over 50 million SIM cards to customers across 60+ countries
✓ Partnered with leading telecom operators, MVNOs, and IoT solution providers
✓ Maintained 99.8% customer satisfaction rating
✓ Achieved industry-leading <0.02% defect rate through rigorous quality control
✓ Provided 24/7 technical support across multiple time zones
✓ ISO 9001:2015 certified manufacturing facilities
Competitive Advantages
Technical Excellence:
- In-house R&D team tracking latest 3GPP and ETSI standards
- Early adoption of emerging technologies (5G SA, SUCI, network slicing)
- Custom firmware and Java Card applet development services
- Comprehensive testing against major network infrastructures
Supply Chain Reliability:
- Consistent inventory of high-demand SKUs
- Rapid turnaround: 7-15 days for standard orders, 3-5 days express available
- Strategic warehousing in Asia, Europe, and North America
- Flexible logistics partners ensuring on-time delivery
Customer-Centric Service:
- Free samples for qualified development projects
- Multilingual technical documentation (English, Chinese, Spanish, French)
- Pre-sales technical consultation and system design support
- Post-sales integration assistance and troubleshooting
- Custom branding and OEM/ODM services
How to Order Your Programmable SIM Cards from HKCARD
Step 1: Define Your Requirements
Identify your project specifications:
- Network type (4G LTE, 5G NR, or both)
- Form factor (2FF, 3FF, 4FF, or combo)
- Memory capacity (128K, 256K, or 512K)
- Special features (NFC, Java Card, CDMA compatibility)
- Order quantity and delivery timeline
Step 2: Request a Customized Quote
Contact HKCARD through multiple channels:
HKCARD ELECTRONICS CO., LIMITED
📧 Email:byronhan@cardmfg.com
🌐 Website: https://www.cardmfg.com/
📱 WhatsApp/Wechat: +8615817372512
Step 3: Sample Testing (Recommended)
We strongly recommend sample validation before bulk orders:
- Receive 5-20 test cards depending on your project scope
- Validate compatibility with your programming tools (pySim, etc.)
- Test network registration and authentication procedures
- Verify form factor fit and mechanical compatibility
- Confirm all writable parameters meet your requirements
Step 4: Place Production Order
After successful sample approval:
- Finalize technical specifications and customization requirements
- Confirm pricing, payment terms, and delivery schedule
- Choose optional services (custom printing, pre-programming, etc.)
- Review and approve production schedule
Step 5: Receive and Deploy
- All cards arrive pre-tested with quality certificates
- Comprehensive programming documentation and templates included
- Technical support available during deployment phase
- Ongoing support for reorders and project scaling
Contact HKCARD – Your Trusted SIM Card Solutions Partner
Ready to experience superior programmable SIM cards with better availability and competitive pricing? Partner with the industry leader trusted by developers, operators, and innovators worldwide.
HKCARD ELECTRONICS CO., LIMITED
📧 Email:byronhan@cardmfg.com
🌐 Website: https://www.cardmfg.com/
📱 WhatsApp/Wechat: +8615817372512
Our Commitment to You:
- Response within 12 hours for all inquiries
- Technical expertise you can rely on
- Competitive pricing without compromising quality
- Long-term partnership approach, not just transactions
- Continuous innovation aligned with industry evolution
Whether you need writable IMSI SIM cards, 5G SA SIM cards, sysmocom alternatives, or white label MVNO solutions, HKCARD delivers the SIM card solutions that power your innovation.
“Sysmocom SJA2 & SJS1 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 Development”
“5G SA SIM Card Manufacturer: 3GPP R16 Compliant Programmable SUCI SIM Solutions with NFC Integration”
“Blank SIM Cards Supplier: Re-Programmable USIM Cards for Open5GS, srsRAN, and Private LTE/5G Networks”
“White Label MVNO SIM Cards: Custom 4G VoLTE & 5G NR Solutions with Java Card and eSIM Support”
#ProgrammableSIMCards #WritableIMSI #5GNRSIM #SysmocomAlternative #HKCARD #pySim #LTESIM #BlankSIMCards #IoTSIM #MVNOSolutions
1 :
“HKCARD Electronics programmable SIM cards displayed in 2FF, 3FF, and 4FF form factors showing writable IMSI, Ki, ICCID, and OP/OPc parameters, compatible with pySim programming tools and sysmocom alternatives for 5G NR and 4G LTE network testing and development”
2 :
“Blank white USIM cards from HKCARD Electronics with 128K, 256K, and 512K memory options, featuring re-programmable architecture using PC/SC tools for Open5GS, srsRAN network stacks, IoT applications, and USIM test solution environments in laboratories and universities”
HKCARD ELECTRONICS CO., LIMITED
📧 Email:byronhan@cardmfg.com
🌐 Website: https://www.cardmfg.com/
📱 WhatsApp/Wechat: +8615817372512