Blank Programmable SIM Card with VoLTE IMS Writing – Mini, Micro, Nano Triple‑Cut for Telecom Operators by HKCARD ELECTRONICS CO., LIMITED

As mobile networks evolve toward all‑IP architectures and VoLTE (Voice over LTE) becomes the standard for voice services, telecommunication operators and service providers need SIM cards that can be precisely configured to match their unique IMS (IP Multimedia Subsystem) environments. Generic, pre‑loaded SIMs can’t do this. HKCARD ELECTRONICS CO., LIMITED now offers a Blank Programmable SIM Card that gives you complete control: write your own IMPI, IMPU, P‑CSCF address, Home Domain, and more, using a standard triple‑cut card that fits Mini, Micro, and Nano trays. Built to 3GPP Release 16 specifications and supporting UST (USIM Service Table) services 122–135, these writable VoLTE cards are the ideal tool for operator labs, network test beds, MVNO profiling, and advanced device development.

A Blank Canvas for IMS – Write All Essential VoLTE Parameters Directly to the Card

Most programmable SIM cards stop at IMSI, Ki, and OPc. HKCARD’s new blank USIM goes much further. It exposes the ISIM (IP Multimedia Services Identity Module) application and lets authorized engineers write the full set of IMS credentials needed for VoLTE registration:

• DOMAIN – the home network domain (e.g., ims.mnc001.mcc001.3gppnetwork.org)
• IMPI – IP Multimedia Private Identity
• IMPU – IP Multimedia Public Identity (one or more SIP URIs)
• PCSCF – the address of the Proxy‑CSCF (FQDN or IP) that the device must discover
• AD – Administrative Data for IMS service configuration

This means you can pre‑configure the card so that the device under test automatically registers to your operator’s IMS core, obtains voice services, and completes VoLTE call setup — exactly as it would on a live network. No manual APN tweaking on the handset, no mismatched IMS settings. Everything is stored inside the card.

 Conformant to 3GPP Release 16 and Advanced UST Service Table Support

The blank programmable card is built around a 3GPP Release 16 UICC/USIM core, ensuring compatibility with the latest network features. Crucially, it enables USIM Service Table (UST) services from 122 through 135 — a range that includes essential IMS‑related capabilities:

• Service 122 – IMS services (ISIM required)
• Service 123 – Support for IMS voice over PS session
• Service 131 – URI support by UICC
• Service 135 – ePCO (enhanced Protocol Configuration Options) and more

By activating these UST entries, the card correctly advertises its IMS capabilities to the handset, guaranteeing that the device’s baseband and IMS stack engage properly during network registration. This level of fine‑grained control is indispensable for operators testing new VoLTE roaming agreements, for MVNOs launching differentiated voice services, and for certification labs verifying handset behavior.

 Triple‑Cut Form Factor – One Card, All Three Sizes (2FF, 3FF, 4FF)

Physical compatibility across test devices is a given requirement on any operator’s bench. HKCARD delivers every blank programmable SIM as a 3‑in‑1 punch‑out card:

• Standard SIM (2FF, Mini) – 25 mm × 15 mm
• Micro SIM (3FF) – 15 mm × 12 mm
• Nano SIM (4FF) – 12.3 mm × 8.8 mm

You simply remove the required form factor from the full‑size card. No adapters, no cutting, no risk of damage to the chip. This ensures that whether you’re testing a legacy 3G feature phone, a current flagship Android device, or an IoT module with a Nano SIM slot, the same card SKU serves all projects.

 End‑to‑End VoLTE Readiness – How It Accelerates Operator Testing and Device Certification

Telecom operators and service companies use these writable SIMs to replicate exact network conditions in the lab:

1. IMS Profile Emulation — Program the card with the home network’s IMPU and P‑CSCF to simulate a genuine subscriber.
2. Staging before commercial deployment — Validate that new handsets, OTT applications, and firmware updates behave correctly with real IMS parameters.
3. Roaming and eCall/e‑Call testing — Because the card supports UST 122–135, it can be used for Advanced Mobile Location (AML) and emergency IMS testing scenarios.
4. QA regression suites — Flash a batch of cards with a known‑good IMS configuration and use them as the golden standard for every test cycle in the CI/CD pipeline.

By moving the IMS configuration into the SIM, you avoid device‑side parameter errors that waste engineering time. The result is more reliable automation and faster time‑to‑market for VoLTE services.

 Security, Provisioning, and Supplier Trust – Why HKCARD Is the Right Partner

All blank programmable SIMs from HKCARD are manufactured under strict quality controls and conform to the relevant ETSI and 3GPP smart card standards. We supply cards with genuine chip security, backed by:

• Secure ADM (Administrative) key transfer — ensuring only your authorized team can write to the cards.
• Custom pre‑programming service — tell us your IMS configuration and we’ll ship cards ready to go, eliminating in‑house writing overhead.
• Bulk and small‑batch flexibility — from a few dozen for a proof‑of‑concept to tens of thousands for nationwide device rollout.
• Global logistics — we regularly ship to operators and certification labs across Europe, Asia, the Middle East, and Latin America.

📬 Contact HKCARD ELECTRONICS CO., LIMITED

Ready to equip your lab or network with blank programmable VoLTE SIM cards? Reach out today for a quote, a sample, or a technical discussion.

HKCARD ELECTRONICS CO., LIMITED – Blank Programmable SIM Cards with Full IMS Write Support, Triple‑Cut, 3GPP R16, for Telecom Operators and VoLTE Testing.