I recently switched from CDMA to GSM and am using a T-mobile I phone 5S and am not getting any signal in areas that show up on the map as having coverage (Center to Northern Hamilin NY and the West end of Ogden NY). I called customer service and they checked with T-Mobile and said the towers in the areas I was in have no issues and that I should have coverage. I was told that when in that area I should just have to turn the phone off and back on and that it should then connect with the towers. I have tried that and am still not getting a signal in those areas. Any suggestions on what I should do, I'm assuming it is a phone or account issue.