if you have your Bluetooth turned on, it is better to keep it off unless you use it to avoid potential virus infections
If your phone under WD2, remove first the memory card except 7650, scan and format it using your PC with memory card reader, u have to reformat your phone:
1. using *#7370# or *#7780#, press OK then wait, insert your SIM and observe, if it is OK, then it is the time to insert your MMC
2. use UFS to reformat, go to in UI settings, press LOCAL, wait till it done, press NORMAL, wait till it done. Then click Format USER are, wait till it done, , insert ypur SIM and observe, if it is OK, then it is the time to insert your MMC
For BB5 units, click everything in UI Options, , insert your SIM and observe, if it is OK, then it is the time to insert your MMC.
If the aforementioned tips are not working well, the last option is to reprogram ur phone by selecting good version, but be careful in choosing the versions cause it might harm to the phone or perhaps it can kill your phone.