# Programmable USIM Cards & Blank SIM Solutions: HKCARD Electronics – Your #1 SysmoUSIM Alternative Supplier
Programmable 4G/5G USIM Cards & Blank SIMs | SysmoUSIM Compatible | HKCARD
HKCARD supplies writable programmable blank SIM USIM cards (4G LTE & 5G SA). Program IMSI, Ki, OPC. Compatible with Sysmocom, OMNIKEY 3121. 12+ Years Experience. Bulk & Wholesale.
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🌐 Introduction: The End of “SIM Card Lock-In”
Are you tired of SysmoUSIM supply chain delays? Do you need blank 5G SIM cards for your Private LTE network now?
HKCARD Electronics Co., Limited is the industry-leading supplier of programmable USIM cards and blank writable SIM cards. With over 12 years of experience in the mobile phone SIM cards industry, we bridge the gap between restricted operator SIMs and fully customizable testing environments.
Whether you are building a 5G Standalone (SA) core network, testing IoT devices, or developing OsmocomBB applications, you need a writable programmable blank sim that works. We provide the Sysmocom SIM cards alternatives you’ve been looking for—in stock, ready to ship, and fully programmable.
📠 What is a Programmable USIM Card? (The Developer’s Tool)
A programmable USIM card (Universal Subscriber Identity Module) is a blank, rewritable SIM card. Unlike a standard SIM from Verizon or Vodafone locked with carrier keys, our cards allow you to write every critical parameter:
| Parameter | Description | HKCARD Capability |
|---|---|---|
| IMSI | International Mobile Subscriber Identity | ✅ Fully Writable |
| Ki | Secret Authentication Key (128-bit) | ✅ Fully Writable |
| ICCID | Integrated Circuit Card ID | ✅ Fully Writable |
| OPC | Operator Variant Algorithm Configuration Key (5G) | ✅ Fully Writable |
| SUCI | Subscription Concealed Identifier (5G Privacy) | ✅ Supported |
| ADM / PINs | Administrative & User PINs | ✅ Customizable |
This makes our writable programmable blank sim usim card the perfect dummy sim for labs and test sim cards for field trials.
🛠️ Our Product Range: From 4G LTE to 5G SA
We don’t just sell “blank sims.” We sell solutions. Our inventory mirrors and exceeds Sysmocom SIM card specifications.
1. SysmoUSIM Compatible Series (The Gold Standard)
If you use sysmocom sim card programming software, you need these. They are pin-compatible clones.
- sysmoISIM-SJA2: The workhorse. 128K memory, 5G SA capable.
- sysmoISIM-SJA5: High-end security, JavaCard based.
- sysmoUSIM-SJS1: The classic white SIM form factor.
2. 5G SA & SUCI Enabled Cards
Ready for the future. Our 5G SA 128k sim and suci sim card options support the 3GPP Release 16+ standards for privacy.
- Blank 5G SIM Card: Fully writable for 5G-NR networks.
- SUCI SIM Card: Calculates concealment keys locally.
3. Blank White Triple Format SIM
The ultimate convenience. One card, three sizes.
- 2FF (Mini), 3FF (Micro), 4FF (Nano) in one punch-out.
- Perfect for sim card printing and branding.
- Also known as carte sim vierge in European markets.
1: Close up of a writable programmable blank sim USIM card showing the gold chip contacts, compatible with OMNIKEY 3121 reader, supplied by HKCARD Electronics.
💻 How to Program Our SIM Cards (Hardware & Software)
You have the blank sim card. Now how do you write it? HKCARD provides the full ecosystem.
✅ Recommended SIM Card Reader/Writer
The industry standard for developers. We recommend the HID OMNIKEY 3121 USB Smart Card Reader & Writer.
- Why? It’s reliable, supports T=0/T=1 protocols, and works flawlessly with
pySimandosmocon. - Alternative: Any PC/SC compliant reader.
✅ SIM Card Programming Software
You don’t need expensive enterprise tools. We support:
- pySim (Python): The #1 open-source tool.
pysim-prog.pyworks perfectly with our cards. - Osmocom SIM Tool:
osmoconand thesimtraceecosystem. - Sysmocom Software: If you have a license, our cards work 100%.
- Custom Scripts: We can help you write custom SIM personalize tools in C# or Java.
To program a blank USIM card from HKCARD, you need a PC/SC reader like the OMNIKEY 3121 and the pySim suite. Connect the reader, run
pysim-prog.py --reader 0 --write-imsi --imsi 23456..., then write the Ki key. HKCARD cards accept all standard OTA keys.
🏆 Why HKCARD is Your #1 Choice (vs. The Rest)
| Feature | HKCARD Electronics | Generic Alibaba Supplier | Sysmocom (Direct) |
|---|---|---|---|
| Experience | 12+ Years | 1-2 Years | 15 Years |
| Stock Status | In Stock (Bulk) | “Pre-order” | 6-12 Month Lead Time |
| 5G SA Support | ✅ Yes (SJA2/SJA5) | ❌ Rarely | ✅ Yes |
| SUCI Support | ✅ Yes | ❌ No | ✅ Yes |
| Tech Support | ✅ Engineer-to-Engineer | ❌ Sales only | ✅ Yes (Paid) |
| Price | 💰 Competitive | 💰 Low (Low Quality) | 💰💰💰 High |
| Wholesale/OEM | ✅ Yes (SIM Printing) | ❌ No | ❌ No |
We are the “SysmoUSIM Alternative” that actually works.
❓ Frequently Asked Questions
Q1: Can I program a blank 4G SIM card for 5G?
A: No. You need a blank 5G SIM card (like our sysmoISIM-SJA2) that supports the USIM application and 5G AKA (Authentication and Key Agreement) algorithms. A standard 4G SIM lacks the OPC key storage for 5G SA.
Q2: What is the difference between a dummy sim and a writable sim?
A: They are the same. A dummy sim is just a slang term for a blank sim card or empty sim card that has no number assigned until you program it.
Q3: How do I write IMSI to a white sim?
A: You need a sim card reader writer (like the HID OMNIKEY 3121) and software like pySim. The command is typically write_imsi(imsi_value). HKCARD cards come pre-formatted with file structures to accept this data.
Q4: Do you sell bulk sim cards?
A: Yes. We specialize in bulk sim cards for IoT deployments and manufacturers. We offer sim card printing (logo/ICCID) for orders over 1,000 units.
Q5: Is the sysmoISIM-SJA5 compatible with Osmocom?
A: Yes. The sysmoISIM-SJA5 is a JavaCard-based SIM. It works with Osmocom, but you may need specific GlobalPlatform scripts to load applets. Our sysmoISIM-SJA2 is easier to program for standard LTE/5G use.
Q6: What is a “writable programmable blank sim usim card”?
A: It’s a SIM card with no IMSI/Ki programmed from the factory. It’s “white” (unbranded) and allows you to clone other cards or create new subscribers for a private network.
Q7: Can you program SIM cards for us?
A: Yes. We offer a sim card programming service for bulk orders. Send us your IMSI/Ki list, and we ship them pre-loaded.
Q8: What is a “suci sim card”?
A: A SUCI SIM (Subscription Concealed Identifier) is a 5G feature that encrypts the user’s identity (IMSI) over the air to prevent tracking. Our 5G cards fully support this.
Q9: Which reader is best for sysmocom sim card programming?
A: The HID OMNIKEY 3121 USB Smart Card Reader is the most cost-effective and reliable option for hobbyists and pros alike.
Q10: Are you a manufacturer or trader?
A: We are a hybrid. With 12 years in the industry, we have direct factory integration for blank sim cards and programmable usim tech, cutting out the middleman.
2: Engineer using HID OMNIKEY 3121 USB Smart Card Reader Writer to program a batch of blank 4g sim cards for a private 5G network project by HKCARD.
📞 Contact HKCARD Today – Get Stock Now
Stop waiting for lead times. Get the programmable sim cards you need today.
- For Samples: Request a test sim card to verify compatibility.
- For Bulk: Ask for a quote on 1,000+ blank sim cards.
- For Tech Help: Ask about sysmocom sim card programming issues.
- HKCARD Launches 5G SA Programmable SIM Cards to Solve SysmoUSIM Shortage
- How to Program Blank SIM Cards: A Guide for Private 5G Networks
- Wholesale Blank SIM Cards: HKCARD Offers Bulk Pricing on Writable USIMs
- OMNIKEY 3121 + HKCARD USIM: The Perfect Combo for Sysmocom Projects
- The Difference Between SUCI SIM and Standard USIM Cards Explained
#Private5G #SysmoUSIM #SIMProgramming #Osmocom #IoT #LTE #TelecomEngineering #BlankSIM #5GSA #HKCARD
HKCARD ELECTRONICS CO.,LIMITED
Whatsapp/wechat:+8615817372512
Skype/Teams：byron1681
Email：byronhan@cardmfg.com
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