my bb 9790 is not working properly if u have any solution by online than please sugges

phone keeps going off my mobile provider's network intermittently, preventing me from making calls or using the blackberry servies. Sometimes I am forced to reboot (remove the battery) before it reconnects. What makes the whole charade more confusing is, it works perfectly on Wifi. Other phones on the same network work perfectly; even tried the same SIM on another handset.

This has been going on for like a month. I made a duplicate SIM; had no problem for some days....just for some days..returned back to going off intermittently. Two days ago, I inserted a thin sheet of paper to serve as a wedge, holding the SIM closer to the reader. It appears I am still in the same situation ven after that.

Any suggestion on how this can be rectified?

hi, try reloading the OS, or may be even borrow a battery? Which OS is this 9790 running currently?