My son visited me here, across Puget Sound from Seattle, when he had T-Mobile and it didn't work well here (ATT/Verizon work well) -- It worked fine in Seattle -- I have read similar reports on several internet groups -- Works well in Europe (The T stands for Telekom, the German phone company).
The key for any cell phone is what works where you will use it -- If you are traveling, I would recommend Verizon or Sprint because they seem to have the best coverages off the beaten tracks.
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