The TT100 Comet is a perfect phone for people who are looking for a budgeted simple and easy-to-use phone Pay as you Go Prepaid SIM Included Warehouse Deals - returned open box phones from TTfone - Grab a bargain. All phones are fully tested and are working. Phones may come with small cosmetic imperfections. Unlocked - simply insert your existing SIM card or any Pay As You Go or contract SIM (except the Three, ID and Smarty network)