AT&T's wireless data changes

$30 a month for unlimited data

$15 a month for 200 megabytes of data; if you go over, you pay another $15 for 200 more megabytes

$25 a month for 2 gigabytes of data; if you go over, you pay another $10 for each additional gigabyte

The prices are in addition to the voice part of the plan, which costs at least $40 per month, plus taxes and fees. Data use over Wi-Fi does not count toward the limits.