Hi, this model is very simple to unlock in Nextel carrier (Mexico)
Just you have to root first with: CF-Auto-Root-jfltecan-jfltevl-sghi337m
Put your phone in Download mode (turn off and press Vol - home and power, then when the warning appear just press Vol +)
Use Odin v1.85
in pda put this file CF-Auto-Root-jfltecan-jfltevl-sghi337m
press start and your phone now is rooted
then in the box just repair the imei changing 1 number any number, your phone is now unlocked
is money time
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