All national carriers have adopted a polity to enact a proration system for early termination fees. These fees are the cancellation fees that a subscriber can incur if they leave a carrier before the contract period is up. These fees are almost always more than $150, and sometimes as much as $200. There is currently a petition the FCC is reviewing to cap these fees.
AT&T made no announcement, and had no press release. Basically, the new policy means that the longer a customer has been with their carrier, the less they have to pay if they violate the terms of their contract and leave early. The policy works like this, for every month of service, your fee is lowered by 5$ a month. The fee can be as low as $60, regardless of if you are closer to the end of your contract than that fee would warrant.
All carriers have said they will enact a similar policy, although AT&T and Verizon are the only ones that have put the policy in place. T-Mobile has announced that they will begin their prorated policy on June 30th. Sprint has announced they would prorate their cancellation fee, but they have not announced the time frame for when their policy begins.
[Via Unwired View]