All of a sudden Sim invalid

[UNIX based]

One day i turned on my 635 from sleep and now it says the Sim is invalid. I havent had it activated for about 3-4 months. Do i just need to call and get it reactivated?

 

[chancooluk]

It depends. Try a different SIM in your phone to make sure the phone isn't the problem.

If you haven't used your SIM for a while it is entirely possible that your network have deactivated it and recycled the number to a different customer.