Originally Posted by sim-unlock.net As mobile phone service providers increase efforts to limit the use of the phones they sell, mobile users are seeking solutions for poor coverage and a limited range of use. Since service providers typically offer new phones at a discount, they protect their investment by requiring customers to sign a multiyear contract and by locking their phones to accept SIM cards for the provider's network only. Using the phone outside the network requires entering a special unlock code, which service providers ...