Portable Cellphone to Desktop Cellphone Conversion

To Do:

• Keypad
  • Map out desktop phone's keypad matrix
  • Test compatability
  • Solder leads to cellphone buttons
  • find solution to the 'desktop phone has 14 buttons and the cellphone has 19 buttons' problem
• connect the desktop phone's handset to the cellphone
  • Identify needed connections
  • Test Speaker and Microphone
  • Install
• desktop phone's cradle should answer and end calls
  • Which possition is magnet switch in when flip is closed?
  • Unsolder magnet switch
  • Solder cradle switch to cellphone
• Ringing
  • Get good electronic bell
  • How to do ring detection?
• fitting the cellphone into the desktop phone
• some sort of battery recharging method
  • What V and I do the cradle provide?