A:AnswerThe 3a line was originally released with Android 9 in May 2019. I bought mine in Feb. 2020 with Android 10 pre-installed. I believe you will receive OS updates through the last feature pack for Android 12. Security updates continue as necessary. Because of the delayed release, the Pixel 4a will most likely will arrive with Android 11 ready for 5G.
A:AnswerYES! I just bought this phone in "Purple-ish" and just popped my straight talk sim card from my ST Locked Galaxy A20 into this phone and it works great.
A:AnswerIf you purchase the unlocked version (even on activate now) then Yes it will work on any GSM carrier world wide. Also it works perfect with Google Fi, which works in Russia and many other countries around the world.