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Original post by: arbaman ,


Here is your answer:

GPP is a SIM spoofing tool that is  inserted into a carrier locked phone along with your local SIM in order  to bypass the carrier restrictions and can be used on local networks.  However, this SIM tool usually has limitations such as no LTE support  and firmware compatibility, meaning if iOS updates to the latest  version, the tool might not work. GPP unlocked iPhones are way cheaper  than factory unlocked iPhones as a majority of these are region or  carrier locked or even refurbished, possibly stolen surplus iPhones  coming from China, Korea, and Japan.