Gprs in saudi arbia

Hi all

ihave digicore device for tracker on the cars,iam trying connect to device from wavecom on pc

throw dialup and at commands but give me no carrier ,

if connect to internet *99# will connect

but ineed to connect to sim card on the cars both send and recive has data sim card ,

want to at commands or dialup connection setting (before make that)

hope to help me