You don't tell us what kind of phone you've got, or what network you're with, (either of which would have been kind of helpful.) This is the kind of information that most carriers deal with for free on their technical helplines. "BRPS"? Are you sure that's not "GPRS"? If so, it's a secondary channel, intended for moving data around at a high speed than the channel used for voice calls. You also don't tell us where you ARE - if it's somewhere where the carriers don't use GPRS (and there are many such places) then you'll get a "no signal" message. For most users, this is no big deal... unless you like sending MMS "photomessages". They're transmitted using the GPRS signal.