AT&T today announced the launch of two new Mobile Share plan options, including a 300MB and a 2GB data plan, both of which include unlimited talk and text. First introduced last summer, AT&T's Mobile Share service plans are designed to allow users to share monthly data allotments across multiple devices. The plans come with both a monthly data cost and a per-device charge that ranges from $10 to $45 based on the data plan selected and the type of device. Previously, AT&T's Mobile Share plans started at 1GB of shared data and then jumped to 4GB, so the new options give customers who use less data additional pricing choices. The 300MB option is available for $20 per month with a $50 charge per smartphone bringing the total plan cost to $70 per month, while the 2GB option costs $50 with a $45 char
