This is a tutorial and step-by-step guide on how to Unlock Samsung Galaxy S6 to use it with any GSM carrier like AT&T, T-mobile, MetroPCS, Rogers, O2, EE or any other sim card. After you Unlock your Samsung Galaxy S6, your phone will be unlocked permanently.
Galaxy S6 Direct Unlock | Samsung, SM-G925F, Galaxy S6
Step: To enable USB Debuggin on Samsung Galaxy S6 edge+, LG G4, etc with the system of Android 5.0 Lollipop is almost the same as that of Android 4.2.x: Step 1. Go to Settings menu, tap "About Phone" option. Scroll to find "Build number" and tap it 7 times until the "You are now a developer" note pops up.