For example, if you have a T-Mobile iPhone and you want to switch to another operator due to a bad network, you have to jump through big hoops to do that. We will start the unlock request for your phone and as soon as the phone Once you unlock your device, we will send you an email with step-by-step instructions to unlock it from the end. Tri Band Unlocked Cell Phones on this page. Since the mobile provider, such as Verizon, relies on a relatively unknown network technology (CDMA), Sprint mobile phones have been manufactured. A SIM slot in recent years can not be unlocked to accept the SIM card to another mobile phone provider. I bought the phone without a contract so I could get the unlock code within a week (although I had to call) and argue a bit). To get a unlock code for your phone or tablet, contact your mobile service provider or the manufacturer who sold the device. We try to provide you with clear information on how to unlock your mobile phones and tablets for use on different mobile phone providers. This is convenient if you want to unlock your phone and spend it on a cheaper network or if you travel abroad and do not have roaming charges or if you sell the phone and just want more money for the phone. Just click the My Account tab, select your phone from the list and select Unlock device to use int SIM from the Manage this device drop-down menu. As for the unlocking, from what I understand when the phone is not rooted (I do not want to do the way I do (keep the guarantee for now, at least while still in the US), that SIM card can only be opened with SIM Verizon uses the CDMA standard and not GSM, but you may be able to use the T-Mobile 4G LTE on the Verizon LTE network, since both are running on the same range. - so the LTE data should theoretically work well.