AT&T in a surprise step Wednesday increased its mobile data plan prices with cap changes to match. New customers will pay an extra $5 per month on plans but will get more data depending on the plan they use. Basic Data Plus users get the least increase, moving from 250MB to 300MB per month with $20 the new baseline; the more common Data Pro plans are now $30 and $50, but supply 3GB (up from 2GB) and 5GB (up from 4GB).
