#sysmoISIMSJA5
Programmable SIMs

Programmable SIMs, Blank SIMs, sysmoISIM-SJA5 Explained | HKCARD MVNO SIM ManufacturerMeta Description: Understand programmable SIM cards, blank & replacement SIMs, and the sysmoISIM-SJA5 (5G SA Rel17) from sysmocom. Discover how HKCARD Electronics Co., Limited, a leading MVNO SIM card manufacturer, delivers scalable MVNO Java SIM cards, LTE 4G USIM cards, and bulk programmable SIMs for global telecom operators.

 

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1. What Are Programmable SIM Cards?Programmable SIM cards are advanced SIM/USIM/ISIM modules with dynamic software platforms (e.g., Java Card) that allow remote or local reconfiguration of:

  • IMSI, MSISDN, ICCID
  • Authentication keys (Ki, K, OP/OPC)
  • Filesystem (EF/DF directories)
  • Java applets (STK, OTA, banking, IoT)

How They Work

  1. Secure Chip: Microprocessor + OS (Java Card)
  2. OTA Updates: Change profiles over-the-air via SMS or IP
  3. ADM Keys: Administrative access for secure reprogramming
  4. Use Cases: MVNO launches, IoT fleet management, roaming, testing
HKCARD Advantage: Our MVNO Java SIM cards (128K–1MB) support full OTA personalization, Java applets, and multi-IMSI for global MVNOs.

2. Blank & Replacement SIM Cards

Type
Definition
Use Case
Blank SIM
Unprogrammed SIM with no subscriber data (IMSI, Ki) but functional chip/OS
Personalization by operators/MVNOs
Replacement SIM
Pre-programmed or blank SIM issued to replace lost/damaged cards
Customer retention, upgrades (3G→4G)

Blank SIM Workflow

  1. Stock Blank Cards → 2. Encode IMSI/Ki via SIM personalization → 3. Deploy to subscribers

Replacement SIM Workflow

  1. Subscriber reports loss → 2. Issue new SIM with same MSISDN → 3. OTA update HLR/AUC
HKCARD Advantage: We supply replacement & blank SIM cards in full/half/quarter SIM, 2FF, and MFF2 formats with rigorous SIM card testing and ETSI/3GPP compliance.

3. sysmoISIM-SJA5: The Current Gold Standard for Programmable 5G SIMssysmoISIM-SJA5 (launched Oct 2023) is sysmocom’s flagship programmable SIM/USIM/ISIM/HPSIM card for 2G–5G SA (3GPP Release 17).Key Features

Feature
Details
Storage
200 kB flash (3x more than SJA2)
Network Support
GSM, UMTS, LTE, 5G SA (all optional files)
Authentication
MILENAGE, COMP128, XOR-2G/3G, TUAK
5G Features
HPSIM, on-card SUCI (S17 variant), DF.5GS full compliance
Java Card
OTA, STK/SAT, developer-friendly (writable fields)
Form Factor
1FF (perforated), MFF2 (IoT)
Tools
pySim-prog.py, sysmo-isim-tool.sja5
ADM Keys
Card-individual for secure reprogramming

Use Cases

  • 5G SA Labs (private 5G, Open RAN)
  • GSM-R (railway communications)
  • IoT/M2M (fleet tracking, smart meters)
  • Research (Osmocom, OAI, 5G protocol testing)
Current as of 2025 – No successor announced.

Comparison: Programmable SIM Types

Type
Programmable?
Pre-Loaded Data?
OTA Updates?
Best For
Standard SIM
No
Yes (IMSI/Ki fixed)
Limited
Mass consumer
Blank SIM
Yes
No
Yes
MVNO personalization
Replacement SIM
Yes
Optional
Yes
Customer upgrades
Programmable SIM
Yes
Custom
Full OTA
MVNOs, IoT, roaming
sysmoISIM-SJA5
Yes
Test profile
Full OTA
5G R&D, private networks

HKCARD Electronics Co., Limited: Your One-Stop SIM ManufacturerHKCARD delivers programmable, blank, and replacement SIMs at global scale with commercial-grade reliability.

HKCARD Offering
Matches sysmoISIM-SJA5
Added Value
MVNO Java SIM Cards
200 kB+ flash, Java OTA
1MB+ applets, multi-IMSI, banking STK
LTE 4G / 5G USIM
Rel17, HPSIM, SUCI
On-card SUCI, 5G-Advanced ready
Blank & Replacement SIMs
Full personalization
Bulk 10K–1M, DDP shipping to 80+ countries
Formats
1FF, 2FF, MFF2
Half/quarter SIM, embedded, CDMA RUIM
Authentication
MILENAGE, XOR, TUAK
Custom algorithms, CDMA2000 support
“HKCARD’s programmable SIMs gave us SJA5-level 5G control with 100x faster deployment.” – African MVNO

Which Solution Should You Choose?

Your Need
Best Option
5G SA research / private network
sysmoISIM-SJA5 (MOQ 10–1000)
MVNO launch (10K+ subscribers)
HKCARD MVNO Java SIM
Blank SIMs for personalization
HKCARD Blank SIM Supply
Replacement SIMs for upgrades
HKCARD Replacement SIMs
IoT / M2M 5G fleet
HKCARD MFF2 Programmable USIM

Contact HKCARD: Scale Your SIM StrategyReady to deploy programmable, blank, or replacement SIMs?

  • MVNO Java SIM Cards (128K–1MB)
  • 5G-Ready USIM (Rel17+)
  • Blank & Replacement SIMs
  • Bulk Orders + DDP Global Shipping

Email: byronhan@cardmfg.com
Phone: +8615817372512
Website: https://www.cardmfg.com/

 

  1. Programmable SIMs vs Blank SIMs vs sysmoISIM-SJA5: HKCARD’s Full Guide
  2. sysmoISIM-SJA5 5G SIM Explained + HKCARD’s Replacement SIM Solutions
  3. Blank SIM Cards for MVNOs: HKCARD vs sysmoISIM-SJA5 Programmability
  4. From Research to Revenue: sysmoISIM-SJA5 → HKCARD Commercial SIMs
  5. 5G Programmable SIMs: sysmoISIM-SJA5 and HKCARD’s Global Alternatives

10 Hashtags#ProgrammableSIM #BlankSIM #ReplacementSIM #sysmoISIMSJA5 #MVNOSIMCard #5GUSIM #JavaSIMCard #SIMCardManufacturer #LTE4GUSIM #HKCARDElectronics

 

Best Regards
Byron

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