Please search the forums before posting for help. answers to your questions may already be answered. this eliminates redundant posts.
thank you
please read this:
http://p168.forumotion.com/tutorials-f4/cect-p168-known-information-t56.htm
follow this:
1) Settings
2)Network setup
3)SIM1 Network setup
4)network setup (AUTO)
see if this finds your signal.
if it doesent, I believe you purchased the wrong P168
if you use the 900 band you should have bougt the "+" version.