Phone unlocking explained: network locks, FRP and what is actually legal

• Network (carrier) lock — the phone only accepts SIMs from one operator. Removable with an official carrier code or supported software service once contract conditions are met.
• Bootloader lock — prevents unofficial firmware from being installed. Some manufacturers allow owners to unlock it; doing so wipes the device and may void warranty.
• FRP (Factory Reset Protection) — Android's anti-theft lock requiring the previously synced Google account after a reset. Removable only with proof of ownership through the correct channel.
• Activation Lock / iCloud — Apple's equivalent. It can only be cleared by the original Apple ID or by Apple itself.

A reputable technician unlocks devices where the owner can demonstrate ownership and where the manufacturer or carrier permits it. That means carrier unlocks on eligible, paid-off handsets, owner-initiated bootloader unlocks, and FRP recovery for a documented owner who lost account access.

It does not include bypassing Activation Lock on a device you cannot prove you own, or removing anti-theft protection on handsets with an unclear history. Those requests are declined, every time.

• Original purchase receipt or invoice showing the IMEI
• The box, if you still have it
• The carrier account details if it is a network unlock
• Any email or account recovery evidence for FRP cases

Clear answers to those four questions separate a professional service from a gamble.

• Is my exact model and firmware version supported?
• Is the unlock permanent, or will it return after an update?
• Will my data be erased?
• What happens, and what is refunded, if the unlock fails?