AT&T customer Kelly Whittaker regularly stands outside her South Boston apartment just to get a cellphone signal or send a text message on her iPhone. In fact, she recently tweeted: “I’m about to throw this phone through a wall.” So Whittaker was surprised to learn her wireless provider earned the number one spot for best overall cellphone performance in the Boston area, according to a company that compares wireless services. “The only reason I haven’t switched is because I am now relocked into a two-year contract.”
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