Cryptophone informa que los mejores resultadas con llamadas encriptadas en Mexico se realizan con el operador Telcel.

Update: 01-07-2008: Tarjetas prepagadas de Telcel permiten llamadas encriptadas

Update: 05-03-2009: Pruebas (Cryptophone G10i, CP300) en México confirman las disponibilidad del servicio

Llamadas encriptadas en los EE.UU. funcionan muy bien.

Pero para efectuar llamadas encriptados en las Estados Unidos, hay que considerar varios puntos técnicos:

On the GSMK CryptoPhone some information, such as contacts and SMS, is stored in Flash Storage. Flash type storage is safe against failure of the backup-battery. You must however be aware that there is no way to securely erase information stored in flash memory in a way that it cannot be possibly reconstructed by sophisticated methods of computer forensics. Even if you erase the information and overwrite it with other data,it cannot be considered safely destroyed when stored on Flash Storage. Flash memory uses its own way of managing files that is beyond the control of the operating system.

Security Advice

Your CryptoPhone is a Communication Security (CCOMSEC) device. It can only be regarded as secure as long as you have 

permanent and uninterrupted physical control 

over the CryptoPhone. Once an adversary could have gained temporary physical possession of the CryptoPhone, it must be regarded as compromised. There is a variety of potential methods that would allow an adversary to listen into your calls after he manipulated the CryptoPhone and gave it back to you. Keep the handset with you securely at all times.You should take it with you to the bathroom,put it beside your bed when you sleep and not leave it alone in the hotel room.

If you have »lost« the CryptoPhone and »find« it back again,it has to be regarded as compromised. Never lend your CryptoPhone.Major intelligence agencies are known for a wide variety of high-tech manipulation methods that are impossible to detect without a massive scientific effort (several months of analysis at the cost of several 100.000 Euros per device).. If in doubt and your security depends on it, consider purchasing a fresh unit.