I wish I had an answer. It seems as though there have been only a few people with the same problem. my passport all of the sudden just had problems with the phone signal after a year of use. No drops, no water, just regular use. Made me furious. No matter how many times I tried to re-boot through link it would remain the same. 2 new Sim cards too. Loved that phone. Still do. I'm suffering with a 5s right now and tempted to move sim back to z10 cause I'm craving bb10.