Ever since AT&T bought Cricket last year, it’s been working to move customers from Cricket’s old CDMA network to AT&T’s GSM network. We know that Cricket is seeing a lot of momentum from that effort, but it’s going to see even more in the new year because it plans on shutting down that CDMA network completely.

Cricket President Jennifer Van Buskirk has revealed that her company plans to begin shutting down Cricket’s old CDMA network on March 15. The initial batch of markets that’ll be shut down are located in Arkansas, Delaware, Illinois, Indiana, Maryland, New Jersey, New York, Pennsylvania, and Washington D.C. The full Cricket CDMA shutdown plan can be found here.

AT&T has slowly been farming Cricket’s unused spectrum for use with its own GSM network. Once it refarms Cricket’s legacy CDMA network, Ol’ Blue will have even more spectrum to shore up its existing GSM service.

This news may come as a bit of a bummer for anyone still on Cricket’s CDMA network, but hey, at least we’re getting a couple months heads-up before the shut down actually begins. Plus, it means that those Cricket CDMA folk can get new phones, while AT&T and new Cricket customers can get improved coverage.