It’s about $80/month each for me. I’ll usually keep two deactivated while they are parked in the barn. I’ll have two active, and the other two are either waiting for me to repair them, or waiting till the other two break down. Sucked that one time I had three down at the same time…
Armorsuit protectors have worked well for me on s21 and s22 phones. Might be worth trying.