TTfone TT660 Mobile Phone for Seniors - Folding Design, Big Button Keypad, and Emergency Assistance, It comes with USB C Dock Charger and O2 Pay As You Go SIM Unlocked - simply insert your FREE O2 SIM card or any Pay As You Go or contract SIM, (except the Three, ID and Smarty network), Please note TT660 takes a Nano SIM card.