Writable Blank 4G VoLTE ISIM/USIM Cards for Telecom Operators
As mobile networks continue to evolve, telecom operators, device manufacturers, and communication solution providers require reliable and programmable SIM cards for testing, development, and deployment. HKCARD ELECTRONICS CO., LIMITED offers professional-grade Writable Blank 4G VoLTE ISIM/USIM Cards designed to support modern telecommunications environments, including 4G FDD LTE, WCDMA, and GSM networks.
These blank SIM cards provide flexibility, security, and compatibility, making them an excellent choice for telecom operators, network laboratories, IoT developers, and mobile device testing projects.
Why Choose Blank 4G VoLTE ISIM/USIM Cards?
Blank ISIM/USIM cards are widely used for network testing, SIM personalization, telecom research, and device validation. Unlike pre-configured SIM cards, writable blank SIM cards allow users to program subscriber data and network parameters according to their specific requirements.
With a built-in 128K chip memory and support for the Milenage authentication algorithm, these cards provide a secure platform for telecom applications. The cards are delivered with the COS (Card Operating System) already installed, helping simplify the programming process.
Key Features and Specifications
The Writable Blank 4G VoLTE ISIM/USIM Card is engineered to meet the requirements of modern mobile communication systems.
Main Features:
• Support for 4G FDD LTE, WCDMA, and GSM networks
• VoLTE (Voice over LTE) compatible
• 128K chip memory for subscriber and network data storage
• Milenage authentication algorithm
• COS pre-installed
• Rewritable and programmable
• CE and FCC certified
• PVC card construction for durability
• Suitable for telecom operators and testing environments
Technical Specifications:
• Product Type: LTE SIM Card / 4G SIM Card
• Chip Memory: 128K
• Material: PVC
• Thickness: 0.30mm – 0.84mm
• Card Size: 25 mm × 15 mm
• Full Card Dimension: 85.6 mm × 54 mm
• Plug-in Sizes: 2FF, 3FF, and 4FF
• Compatible Networks: 4G FDD LTE, WCDMA, GSM
• Certification: CE, FCC
• Origin: Mainland China
Flexible 2FF, 3FF, and 4FF Compatibility
One of the major advantages of these blank SIM cards is their multi-format design. A single card can be used as:
• Standard SIM (2FF)
• Micro SIM (3FF)
• Nano SIM (4FF)
This flexibility allows the same card to fit a wide range of mobile phones, industrial terminals, IoT devices, test equipment, and communication modules. Telecom operators can reduce inventory complexity while maintaining compatibility across multiple device platforms.
Secure Authentication with Milenage Algorithm
Security is a critical component of modern telecommunications networks. These blank USIM cards utilize the Milenage algorithm, which is commonly used for authentication and key generation in 3G and 4G mobile networks.
Combined with the card’s 128K memory capacity, the solution provides a reliable platform for storing subscriber identities and network credentials while maintaining high security standards.
Applications for Telecom Operators and Developers
The Writable Blank 4G VoLTE ISIM/USIM Card is suitable for a wide range of professional applications, including:
• Telecom network testing
• Mobile device certification
• SIM card personalization
• VoLTE service validation
• LTE network development
• IoT device testing
• Wireless communication research
• Laboratory and educational telecom projects
• Operator system integration testing
Because the cards support GSM, WCDMA, and LTE technologies, they can be used in multi-network environments where interoperability testing is required.
Quality and Compliance
HKCARD ELECTRONICS CO., LIMITED places strong emphasis on product quality and compliance. These SIM cards are manufactured using high-quality PVC materials and comply with both CE and FCC standards.
The certifications demonstrate conformity with international requirements and provide confidence for customers operating in global telecommunications markets.
Storage and Handling Recommendations
To ensure optimal performance and service life:
• Store cards in a cool, dry environment
• Avoid direct sunlight
• Keep away from excessive heat and humidity
• Protect cards from physical damage and contamination
• Handle chips carefully during installation and programming
Proper storage helps maintain the integrity of the card and ensures stable operation during testing and deployment.
About HKCARD ELECTRONICS CO., LIMITED
HKCARD ELECTRONICS CO., LIMITED is a professional supplier of SIM cards, smart cards, RFID products, NFC solutions, and customized card manufacturing services. We provide programmable SIM card solutions for telecom operators, system integrators, IoT companies, research institutions, and technology developers worldwide.
For bulk orders, customization, and technical support, please contact our team.
Contact Information
HKCARD ELECTRONICS CO., LIMITED
📧 Email: byronhan@cardmfg.com
🌐 Website: https://www.cardmfg.com/
📱 WhatsApp / WeChat: +86 158 1737 2512
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