Transmit files through voice calls (Data Over Voice – DoV)

In some (less developed) countries the majority of mobile phone users do not yet have access to GPRS. For instance India and Africa.

However, it occurred to me it will be possible to write an application on Series 60 to transmit files using audio FSK through the normal voice channel of the phone. This may be a very interesting technology option for certain type of use cases. This would remove the requirement for the user to have a GPRS subscription. Only requirement for the user would be to have a voice subscription and software installed for decoding and encoding the audio FSK stream.

File exchange would be possible between mobile phones (P2P) or between a desktop computer/webserver with modem and a mobile phone. Optionally this data stream can be encrypted for security.

On CeBIT 2009 there were a lot of suppliers for Crypto GSM solutions. However, I did not see any supplier for a solution which only uses the voice channel. All suppliers also focused on voice encryption. No suppliers had any focus on file sharing which could be equally important, I guess.