BB user in china

hi everyone

need some help here, i just bought BOLD OS 4.6.0.167. and i download some applications such as win live messg, yahoo messg, opera mini.
but none of those works on my mobile. (i have change my APN to CMNET)
1. when i launch opera mini its said "failed to connect to internet" contact your service provider for internet setting
2.when i sign in yahoo messg is said "no data service"
3.when i sign win live messenger i wait long time but it keep try to sign in

i have no problem in using internet browser, only from the application which i download to my device.

please the advice, thanks in advance