Pc Studio Software Free Download. You were travelling abroad and desired a T-Mobile unlock to use the local carrier of the host country to cut down the expensive roaming charges, but your locked handset rejected the local carrier SIM card. Restriction to consumer’s freedom to choose an operator seems frustrating.

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Let’s understand the reason of locked mobile phones in detail. Technical Barriers of T-Mobile Unlock Mobile devices work on CDMA and GSM technology. When these devices are sold, they are locked to a specific cellular carrier.

It means the device is compatible with that particular carrier. You have to get it unlocked first to switch to another network.

Remember there are some cell phones that will not work with another operator, even after they are unlocked. T-Mobile and AT&T use GSM, while Sprint and Verizon incorporate CDMA wireless standards. CDMA and GSM based phones are incompatible with one to another. This means, your CDMA phones purchased on Verizon, may not work on T-Mobile’s GSM network and vice-versa. Here comes the IMEI unlock service to help you. You can unlock T-Mobile iPhone or other mobile device and switch it to AT&T carrier for example. The GSM/CDMA technology difference is a legal technical barrier of switching phones between carriers.