Has anyone had problems with connecting to the GSM network? I have a deal with one of our national operators. When the SIM card is inserted to a normal cell phone, it connects without any problems. But, when inserted to Geetech SIM900 GPRS shield, it has difficulties to register to the net.
On my desk it connects only occasionally, in our kitchen it connects better. Seems, that the shield needs really strong signal to register to the net. Last week in another city it connected every time without problems. What can I do to get it registered more reliably? This leads to antenna related issues, but everything seems to be ok. It has a removable antenna and from the antenna jack a thin lead goes to the board to another really small connector.
Picture in this link: http://www.geeetech.com/wiki/index.php/File:GPRS1.jpg