T-Mobile to AT&T or Verizon
New to the forum and looking for some answers/advice. After being a long time Verizon customer I decided to switch to T-Mobile this past May 5th. Even though my reception and LTE coverage in Philadelphia is generally good, unfortunately in my apartment I have "No Service". Sometimes I can get 1 bar by standing by my bedroom window, and if I go outside I may get 2 bars. I've been talking with T-Mobile tech support, and after several attempts to correct the problem, I was told the problem their signal is unable to penetrate my brick walls. With Verizon I had always had two or three bars. Even though I do not blame T-Mobile, I will have to find another carrier since my mobile phone is my contact point for my employer, friends, family, etc., and it has really become a problem.
I paid for my iPhone 5 in full and have met the 40 day requirement to unlock the phone. My question is it possible to switch over to AT&T using the same phone I purchased from T-Mobile? I know Verizon uses a different network, but is possible to go to Verizon? Sorry, I am not a tech person and I never did this before, so I am not sure how all this works. Any advice would be appreciated too.