I'm having a problem with the sms facility on my e616 handset.

When a message is received the handset notifies me in the normal way, but when the inbox is opened it says that there are no messages in the folder. This is the same for the outbox, but the messages do get to the recipient.

Each time the phone is switched off the message register (bottom left of messages screen) is wiped clean.

The sim card doesn't seem to be the problem as I've tried other sim cards in the handset and they all act in the same way.

Have I received a virus? Is there anyway to reactivate the message settings on the handset?