Help IDEOS U8150 text messages not appearing

received messages (SMS texts) come up in the notifications bar at the top but then don't appear at all in the text threads (folders), neither do my sent messages. I am required to read them out of the notifications bar, which is annoying as hell. This has only started since i had to take out the simcard and put it in my old phone after i lost the charger to this phone, now i have a new charger and this messaging problem starts