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It is possible, but it is difficult from my perspective.
It can be like this
1. There can be a user interface in PC that takes the user input.
2. Commpunication between PC and mobile using IR/bluetooth/usb
3. A program in mobile phone that receives the message from PC and makes a call or SMS
Here the main problem is the platform that u have to use. In PC u have to use windows or linux. It should be supporting bluetooth or IR. The programming langulage should be C/C++/VC++/Java depending on the api support.
In mobile u have to write the program wither in Symbian or in J2ME.
I am also interested in such a project. Please let me know your status.
How to connect a mobile phone directly to the microcontroller?
Added after 9 minutes:
DKU-5 connects your Nokia to your computer. Works with Nokia PC suite software as supplied with your phone and enables data transfer and synchronization at a rate of up to 230 kB/s. Driver CD and instructions supplied. Connects to the POP port on the phone and the USB socket on a PC.
DKU5 cable is compatible with Nokia 3100, 3200, 5100, 6100, 6220, 6610, 6800, 7210, 7250, 7250i.