I installed android 12 on my S21+5G today and was surprised, no problems so far. It did fix some problems I had and it has some neat new features, like e-sim. It allows you to have 2 phone #'s on your S21 phone and only one actual Sim card. E-sim takes the place of the second Sim card. Right now only one or 2 carriers have it for androids.
Do you notice that you can not change your text message tones? I've come into this problem since the update. The default messaging app is not allowing me to customize tones. That feature has disappeared.
You have my attention, Sarahys. I like changing my tones too. I would love to help. You can easily change it here: https://www.verizon.com/support/knowledge-base-201255/ What happens when you try this? -Amber