The TTfone Lunar TT750 is our top of the range, easy-to-use mobile phone for seniors. Warehouse Deals - returned open box phones, mobiles are fully tested and are working. Phones may come with small cosmetic imperfections. No Dock charging station - 3 Months Warranty. Unlocked - simply insert your existing SIM card or any Pay As You Go or contract SIM (except the Three, ID and Smarty network).