A few years ago, AT&T wanted to buy T-Mobile. They are both GSM carriers and their networks and some phones are compatible. Well the AT&T deal was squashed and T-Mobile has been reducing prices when your bring your own phone. Big Magenta is expected to get in the pink at CES by announcing some kind of deal for those who leave AT&T. Today AT&T offered some credits and trade-ins to lure away T-Mobile customers.