Following AT&T and Verizon, Sprint and T-Mobile USA are also offering FREE calls and SMS to Japan for a limited time.

T-Mobile USA postpaid customers will be able to make calls and text messages to Japan without charges through March 31, 2011. This also includes T-Mobile’s Wi-Fi calling too.

Sprint customers will be able to text message and make wireless calls to and from Japan on the Sprint network FREE of charge till April 10, 2011from March 11, 2011.

Both carriers are also waiving text message fees to mobile giving campaigns. It’s very good to see everyone pitching in where they can.