Re: my 9900 is T-mobile's. but sim card is at&t
As has been said before above, you're better off calling AT&T to get accurate information. However, since you have a 9900 who knows if they have the proper service books.
Based on their wireless website, for supported Blackberry's, it seems the monthly plans are like this:
DataPro 2GB for Blackberry for 4G - $25.00/month
DataPlus 200MB for Blackberry for 4G - $15.00/month
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