AT&T locked S20 to T-Mobile.

Samsung Galaxy S20 & S20+ & S20 Ultra
Hey guys, new here and was looking for a quick info. Last time I’ve owned a Samsung phone was the S7 and I remember being able to flash the AT&T version to the unlocked version using some software that I believe was originally for developers only.

Anyone know if that is still possible today with the S20? I also plan to purchase an unlocked code so I can use the AT&T version to T-Mobile. Will there be any missing bandwidth or 5g issues using that phone on the T-Mobile network?

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