My mother has an unlocked iPhone 4 that I bought here last year and for the past month she's been having reception issues: dropped calls, bad voice quality during the call, "No Service" or "Searching" appear several times during the day at random times.
She is very frustrated since she has her own business and not having a reliable coverage isn't helping her run the business. I have recently updated the phone to the latest carrier update but that didn't solve the problem.
Her home zip code is 53092. I have read quite a few threads here of people having similar issues. It seems that the issue is between Tmo and iPhone 4 particularly. Has anyone found a solution or heard anything positive about this annoying issue?