Secure GSM

Professional protection of confidential data

Special 4G phone TB-7

The next-generarion special phone TB-7 is protected against all the decryption systems. For your comfort and total safety at least two phones TB-7 are needed (for you and your interlocutor). The phone is compatible with SP7 offered so far.

The phone is entered in Register of radio and / or electronic communication devices of the State Agency for National Security and has a Certificate of registration No 11 in accordance with Art. 274, para. 1 of the Electronic Communications Act (ECA)

Special 4G phone TB-7

TB-7 specifications

  • Symmetric encryption algorithm;
  • 256 bits key length;
  • The public key 256 bits is newly generated for every communication session calculating elliptic curves parameters according Diffie-Hellman Public Key scheme;
  • Communication session key is a combination of public key and secret key created by user (by means of “key generation center” application) and installed into the phone
  • Compatible with Special phone SP7
  • SMS encryption
  • Wi-Fi
  • VoIP
  • Network coverage: 2G / 3G / 4G (LTE)
  • Weight: 150 g
  • Dimensions: 112х44х18 mm

The special encrypted cell phone TB-7 provides guaranteed protection against wiretapping of your phone calls in 3G/4G mobile phone networks, WiFi. Besides, it is not important where you are - at home, in the country or abroad. The ordinary phones can be easily intercepted and quickly decrypted, which means that your conversations can come to knowledge of:

  • Business competitors (technical espionage), special services;
  • Criminals;
  • Private detectives hired by the husband/wife.

The Special phone TB-7 is fully compatible with previous special phone SP7, but unlike it it operates in safe mode not only in 2G mobile networks (it uses channel switching), but 3G/4G and WiFi standard networks (using packet switching).

To operate in 3G/4G and Wi Fi networks it is enough to use the services of Internet service provider that provides IP-telephony with SIP signaling, RTP required (Real Time Protocol), maintaining the pseudo-codec Clearmode [RFC 4040] .


To be your phone protected:

  • it must contain special crypto processors inside which not only encrypt calls but also protect your environment from audio monitoring (wiretapping and recording of conversation on the premises);
  • it must not operate under any popular operating systems like iOS, ANDROID, WINDOWS, SYMBIAN etc. for which great number of viral programs are developed;
  • A crypto-scheme with the length of the session key of at least 128 bits for «SECRET» and 256 bits for «TOP SECRET» should be used;
  • Encryption keys should be produced either by the phone owner or by its authorized representative.

Among all the special phones available on the market of the encryption appliances, SP7 and TB-7 have all the required features.


The special phone TB-7 has:

  • its own exclusive development (scheme, operating system, cryptographic provision and software, phone design);
  • unique cryptographic software;
  • exclusive scheme does not allow to make "radio bug" of the phone;
  • Bulgarian production. No any foreign "bugs" or "beetles" inside;
  • 100% virus protection;
  • 256 bits long communication session key guarantees wiretapping protection;
  • Key Generation Center. Possibility for crypto-keys generation
The TB-7 phone is protected against all decryption systems. The session key is calculated by adding the public key and secret key generated by the users themselves by means of „Key Generation Center” included in the set.


About us

Secure GSM was founded in 2015 with main activity in development, production, introduction, installation, tuning, testing, servicing and destruction of encryption (cryptographic) media, including sertified ones, designed for cryptographic protection of the information in its processing, storage and transmission through comunication channels.

Contact us

  • Address: Bulgaria, 7700 Targovishte,
    10"Panagyurishte"Str., BC-BI, office 6
  • Phone: +359 898 778 128
  • E-mail: