My N900's antenna is working very bad, not in every call, but very often. The signal is full, 3g,2.5g,2g, but this changes nothing. I've open the device with the level 1-2 guide and i've unmount the antenna two-three times. My questions are: is there a method to test my antenna? is it possibile that is a software-related problem? did I have broke something by opening my device? where can I buy a new antenna? thanks!