Sim sim-free ~ (Subscriber Identity Module)- A chip smaller than a man’s thumbnail which contains the number and network subscription of a mobile phone and sometimes other data. Move the chip to another phone and the phone number moves with it. A sim- free phone is one bought without a number and not tied to any particular network. There are currently three types of different sizes. The standard SIM is the largest used in older phones the smaller micro- and nano-SIMs are used in the latest smartphones.