Iphone 4s Price Usa Factory Unlocked on this page. References GSMLiberty: Unlock Code Phone Store T-Mobile: Contact Us About the Author James Johnson is an author and a professional blogger on a variety of technology, health and finance writing his time questions. If the customer has changed the original software or IMEI, we are not responsible for the app not working (do not install custom firmware such as the Avatar or Cyanogen before unlocking the phone). In addition, the unlocking of the phone before leaving your current airline will be smart, as an incentive to help you through the process will not be so good. When he checked out, she said that the sim cards should be sent the following day, which was April 17, 2013 and was delivered on April 18th. Two days no SIM card was handed over. It is convenient when you unlock your phone and want to use it on a more favorable network or if you are traveling abroad and want to pay some roaming charges or when you sell the phone and just want to get more money for the phone.