Cue the outrage button. A South Florida woman got a shock when she opened a recent cell phone bill: she owed $201,000. Say what! It was no mistake. Celina Aarons has her two deaf-mute brothers on her plan. They communicate by texting and use their phones to watch videos. Normally, that's not a problem. Aarons has the appropriate data plan, and her bill is about $175. But her brothers spent two weeks in Canada and Aarons never changed to an international plan. Her brothers sent over 2,000 texts and also downloaded videos, sometimes racking up $2,000 in data charges. T-Mobile...