Customers now have an availability date for the shared data plans AT&T announced last month. Starting August 23rd, AT&T will launch their Mobile Share plans, which allow subscribers to pair up to 10 devices with a single service plan featuring unlimited talk and text and data options starting at $40 per month for 1GB of access. The options largely mirrors Verizon’s Share Everything plan introduced earlier in the summer. To help customers determine the proper data allowance, AT&T has introduced a Mobile Share planner tool to their site. You can check out more info at AT&T’s blog post announcing the availability.