ATT is announcing changes to its Mobile Share line of wireless plans today, rolling out a new Mobile Share Value structure on December 8th that offers subscribers a discount on service if theyre not on a hardware contract. ATT has actually tinkered with virtually every aspect of the Mobile Share pricing model. Meanwhile, the company is standardizing its fee for each smartphone that you attach to a Mobile Share bucket — a flat $40 instead of the $30 to $50 it charges now, depending on bucket size. For virtually everyone else currently using Mobile Share, the changes mean anything from a net zero difference to a fairly substantial savings depending on the data bucket, the number of phones attached, and whether theyre on-contract.