Geeetech

Thanks for you answer.
http://www.seeedstudio.com/wiki/GPRS_Shield_V2.0#top - that's the tutorial I was searching. Very very helpful. Thanks a lot - I connected and send a message

Hello guys!
My hardware is:
1) SIM900 GSM GPRS shield
2) XDRduino UNO

My software is:
"C:\Program Files\Arduino\libraries\GSM\examples\Tools\TestModem\testmodem.ino"
- an example tool from arduino library.

My problem is:(COM PORT received data:)
Starting modem test...ERROR, no modem answer ...