GPRS disconnecting problem

[Guest sibtain]

Hello!

i have some problem with my Orange SPV C500. i connect my MSN on my phone but when i get any call, sms or even misscall the phone automatically disconnects the GPRS. Before this MS smartphone i was user of Symbian like 7650, 6600 and 7610, but these phone don't disconnects GPRS on it's own. they hold the GPRS on call, sms or misscall. i am in Paksitan and i am using UFONE. UFONE is my service provider.