The TTfone TT150 Black Dual Sim Cheap Mobile Phone for Emergency Use. It comes with Mains Charger, Giffgaff Pay As You Go 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 Giff Gaff SIM card or any Pay As You Go or contract SIM (except the Three, ID, and Smarty network).