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Unlocked Samsung Galaxy S7 Active seeking updates
I have an unlocked Samsung Galaxy S7 Active (G891A). It is currently updated to baseband version G891AUCS2BQH1, and cannot receive further updates because when checking for updates, it believes it is up to date. I gather from this thread [https://forums.att.com/t5/Android/Oreo-upgrade-unlocked-Samsung-Galaxy-s7/m-p/5566528#M107599] that I can only receive FOTA updates if I have an active AT&T SIM card.
My question is, if I go out and buy a prepaid AT&T SIM card and put it in my unlocked phone, will that be enough to get software updates? Do I need to enter a contract or something as well?