I've used the phone for sometime now. But of late i starting noticing some problems with it. It's always reminding me to Check Operation Service. What could be the cause and meaning of this? Please somebody help me out.

Check operation service/check info service. It's not necesarily a problem. This can happen when you lose/receive signal, come into signal range, etc. it's just an informational message. You should be able to turn it off though. Check yoir phone's settings if you want to deactivate it.

@ Bossman
thanx man