That depends on which companies sold the phones that you want to unlock. I only know about Tracfone and Metro-by-T-mobile.
* Tracfone: Android phones sold by Tracfone are still using an unlock code keyed into the phone using the dialpad. Reportedly, their unlock codes are really hard to crack and there are no companies that claim to be able to unlock TF Android phones.
* Metro: Android phones sold by Metro in 2023 (and maybe in 2022 also) use the same unlock method as iPhones. There's a database of IMEI's of unlocked phones. When a phone is eligible to be unlocked (typically 6 months after activation), Metro adds its IMEI to the database. After that, when the phone is connected to WiFi and the owner selects "Network Unlock" (or similar wording) in Settings, the phone connects to that database. If its IMEI is found in the database, then the phone's Unlock Status is updated over-the-air.
There's This Company that claims to be able to unlock many phones by using its status as a Phone Recycler to add a phone's IMEI to the appropriate database. I've read posts saying it costs $29 just to see if they can unlock your phone, and another $60 or more to unlock it. There are also posts saying it's a scam.
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