Originally Posted by kv7shadow
i wanna buy SM-G900T and it is 650 $, therefor i suppose it is unlocked
how can i check if it is factory unlocked? or it was locked and some fella unlocked it with a trick or something (if it is possible )
and if i install any official or custom ROM, will it be locked again?
If you are buying it for 650, buy it straight TMo. Why do you want a used one.
If buying used, you can get it for around 500. BUT... if the person reports it as stolen later, or if he defaults on its payment (if not purchased in full like on contract), the carrier can blacklist it, and you won't be able to use the phone.
S5 has been notoriously famous in US for that latter given that all major carriers are now using an integrated database of blacklisted IMEIs.
Request to see the bill from the person you are buying phone.
For AT&T, you can have him come to AT&T store, n then take the phone to the person there and have a new SIM inserted (different SIM, but same number) and register the IMEI on your name. This way the owner cannot blacklist the IMEI after the IMEI is registered on your name.
I am not sure if this process is followed by TMobile too.