Шифрованные SMS
When installed on 2 phones, it allows you to encrypt and send (and then receive and decrypt) SMS messages so that they are not readable by any party in transit, including the GSM operator. The SecureMessenger consists of common API, two implementations of the API so far (for Siemens M50 and SL45i), common UI and localization utility (currently only
English-language resources file exists, easily translatable to any language)
В данный момент поддерживаются Siemens SL45i/M50/S55 (и, наверное, более новые) и Nokia