My motorola hiptop/sidekick slide......?

is coming up with a thing saying:

Network Services Unavailable
Either your GPRS APN setting is incorrect or your account is not configured for GPRS

I've had the phone for about 3 months and im on telstra pre-paid. the phone is unlocked as i called telstra and demanded they unlock it for me lol.
anyways i know someone who has it on pre-paid also and the internet and msn and stuff works for them but i havn't done anything about mine. its no big deal coz im selling this but i would like to have internet on it until i get a new phone. the sms/mms/calls all work fine but for some reason i get that message when i try to use the internet or msn. any help would be much appreciated, but if all else fails i will call telstra.
THANKS :)
 
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