[ikkun]

last phone I had was a motorola, you can unlock the bootloader but you have to make an account, give them the IMEI and request an unlock code. it probably has to be a carrier unlocked phone too. the latest motorola phones look to be the same way. pixels are afaik the only phones atm that you can just unlock without any fuss, so long as they were never used with verizon.

I once bought a oneplus phone to unlock the bootloader, they have the same process requiring an account etc, saying it could take up to 2 weeks to get the code. they never emailed it to me so I returned the phone.

[precompute]

Yes. And once you have the unlock code, you can re-lock the bootloader and unlock it as many times as you want to.