Unexpected charges can be frustrating! Several device functions can utilize data. Do you stream music or videos (YouTube, Slacker , Pandora)? Are you applications set to only update via wi-fi? Additionally, do you use wi-fi whenever possible?
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Thank you for answering my question. I don't
Use my phone for music. I'm not allowed to use
My phone at work. So I really only use it at home
And I have wi fi. I only use it for Facebook and
Candy crush. I guess I could have left an app open.