AT&T seems to have stepped things up quite a bit in terms of data allotments for Mobile Share plans. With the previous plans offering data options from 1GB up to 20GB, AT&T has since announced plans that offer up to 50GB. More specifically, the carrier has added a 30GB, 40GB and 50GB option. The one catch -- they don't come cheap. These new higher data plans are going for $300, $400 and $500 per month.