I can't give you a direct solution right off the bat, but I can give you a good troubleshooting tool. Normally, I would recommend using NI-Spy. You can find it at Start->Programs->National Instruments->NI-Spy. To see what exactly is going on on the port. I don't think it works for hyper terminal though. What you could use is a 3rd party program such as Com Port Monitoring Component. Usually, you can use the port monitoring tool, and if you're able to make them send the same information, then it should work fine.
Can you let me know if this helps?
thx can for ur replay
PIC: PIC microcontroller "PIC16f877A"
mobile: cell phone
i connect the linkmatik 2.0 without the PIC as the connection which i explain it previously then i try to discover the linkmatik in my cell phone - i search about new devises - but no devices found, so i dont know where is the problem? is it from my connection or the link matik didnt work properly?