IDEA: Using a Pay-as-you-go phone as free Skype gateway

Hi,
   my phone company has given me my old phone with a free SIM card when I extended my contract with them. Recently I noticed that I have free skype inbound calling on this SIM card.

  Currently, a skype gateway requires some siptosit software to bridge skype and open voip. Using a sound card with some custom cables to simulate a hands free kit I realised that it may be possible simulate a mobile phone to skype gateway. The bluetooth messaging system may even be helpful in identifying calls and callers. Arguably the actual implementation may well be more complex than a siptosit gateway - but this method does not require a fixed internet access.

  A caller who wants to get in touch calls my skype ID. The call will be handled by the mobile phone provider inbound and causes a connection request on the phone. The phone will message this via bluetooth to the server on the other side of the audio connection. The voice will be sampled via the soundcard and forwarded (possibly using some asterisk server) to the correct extension.

  The same may be possible the other way round. A voip enabled house phone would call an extension to create a skype outbound call. The bluetooth connection will establish the skype connection and the audio will be created using the speaker output on the server.

  Of course a more sophisticated process would simulate a bluetooth hands free kit and do away with the cables to the mobile phone.  Another interesting potential to use some data over voip such as file upload via skype.