Not knowing how much data you use on your cell phone, or how many text messages you send and receive, can be costly.
Kerfye Pierre, a 27-year-old FEMA employee from Hyattesville, Md., unknowingly incurred a whopping $30,000 in roaming charges after she went to Haiti to help with earthquake recovery.
Robert St. Germain, 66, a retired Dover, Mass., marketing consultant was stunned by an $18,000 bill after a free trial on mobile phone data downloads expired without notice.
And, 59-year-old...
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