ReliaSpeak™ MEC520
Mobile Communication Encryptor

Hardware encryption device, used with Android phone or iPhone,
to effectively protect user call privacy...

ReliaSpeak™ MEC520 Mobile Communication Encryptor is a hardware encryption device that can effectively protect users’ mobile call security. Based on ReliaSpeak’s world-leading AMSI digital modulation technology and 100% digital voice encryption technology, MEC520 achieves end-to-end encrypted calls over the GSM/WCDMA voice channel, and supports for encrypted communication with ReliaSpeak™ Crypto Phone and ReliaSpeak™ Landline Encryptor.

Following the low-sensitivity design concept, there is no keyboard and screen for MEC520. It is used as an accessory device for iPhone or Android mobile phones. Settings and the encrypted calls’ calling/answering are all operated by a special APP via Bluetooth. All these designs make many advantages such as small size, convenient carrying, concealed using, etc.


  • As an accessory device for iPhone or Android phones, MEC520 needs an independent SIM card.
  • Supports encrypted calls over GSM, WCDMA/UMTS cellular networks* .
  • With encrypted SMS function.
  • Encrypted calls are not restricted by carriers and regions.
  • Supports encrypted communication with ReliaSpeak™ Crypto Phone and ReliaSpeak™ Landline Encryptor.
  • Low sensitivity design, card size, convenient and concealed carrying .

Activate your exclusive security number

Separates normal/encrypted calls, make encrypted calls invisible

  • Equivalent to a dedicated secure phone, using an independent number.
  • Only encrypted calls are supported, and clear calls are automatically hanged up to ensure separation of normal and encrypted calls.
  • Calling/Answering of encrypted calls is operated by APP, without direct operation of the device. The encrypted call process is hidden, that makes you calm and natural in any situation.

The most reliable calls privacy protection

Protecting against any form of line eavesdropping
  • Uses digital encryption technology instead of analog scrambling technology, Encrypted voice does not have any speech property.
  • End-to-end and real-time negotiation of secure key does not rely on carriers or third-party security services.
  • Uses AES-256-CTR algorithm, real-time secret key replacement is up to 5 times per second.

Make Encrypted calls to Landline

Compatible with the ReliaSpeak™ Landline Encyptor,  Make encrypted communication between landline and mobile phone possible.

Easy to use

Uses ReliaSpeak eCalls App to make/answer encrypted calls

  • Inserts the SIM card into the MEC520; installs the ReliaSpeakTM eCalls app in a regular smartphone and connect to the MEC520 through Bluetooth.
  • Operates the eCalls APP to dial the number of the remote MEC520.
  • The remote user operates the eCalls to answer the incoming call, and the two parties of MEC520 will start to establish a secure link automatically.
  • After the secure link established, users can start talking in encrypted mode. If the secure link cannot be established, the calls will be hanged up directly.


Network3G : 900/2100
2G : 850/900/1900/2100
Key exchange algorithmECDH
coding bit rate of encrypted speech1.2kbps
Encrypted SMSSupport
App communication Bluetooth 4.0 BLE
Dimension 84 X 55 X 14mm
Battery 1200mAh
Endurance Calls: 2h, Standby: 24h
Operating system that supports the ecalls applicationiOS 9.0/10/11/12;
Android 5.0 or higher