AT&T has announced the addition of two new lower-priced Mobile Share plans. The new 300MB tier is $20 a month — considering the extremely low data amount, AT&T may be looking to make a dent in the prepaid smartphone market. This tier may also appeal to first-time iPhone owners who may upgrade in the future, and customers who would only use data on very rare occasions. The new 2GB plan costs $50 a month. This tier may appeal most to a current…
