Why is my iphone 4 roaming web 24/7?

This has never happened before. Sense the beginning of the new billing cycle, 3 days ago, it has been "roaming web" nonstop according to my account on the ATT website. In less than three days, it has used nearly 4 gigs of data! It is using data nonstop, even while I sleep. What's going on? I already plan on calling ATT when they open and/or stopping by today. Just want to know if others have had this problem?

Most likely you have the data roaming on. On your iPhone go to your settings and go to general then cellular/network then go to roaming and turn off the data roaming.

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