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AT&T's roll over policy is not all that great, especially if you choose the data tier which is right for your needs.
Data rolls over for 1 month only. You use your allowance before any rollover data. Rolled over data will not roll over to another month.
For example:Data allowance = 10 GB
Month 1 - 9 GB usage = 1 GB rolled over to month 2
Month 2 - 7 GB usage = 7 GB used from your allowance, 3 GB rolled over to month 3, 1 GB from month 1 lost.
Month 3 - 10 GB usage = 10 GB used from your allowance, no data rolled over to month 4, 3 GB from month 2 lost.
Month 4 - 11 GB usage = 10 GB used from your allowance, 1 GB of overage charged to you.
Of course, you could always switch to Project Fi, where you are only charged for the data you actually use and refunded any cost for data you don't use. If you have a 1 GB($10/GB cost) allowance and only use 0.5 GB, you would be refunded $5 at the end of the month. If you use 1.5 GB, you would be charged an extra $5 at the end of the month.