I never have problems with phones from ebay. Take your time, look and read closely. I buy a lot of the cheap ones for family members who are too rough/careless with their phones, and it’s worked out pretty good.
I’m surprised with the reactions to this. The only people I use whatsapp with are all outside the US. It’s discord/telegram/sms for everyone in the US and it’s miserable.
But Volatilability sounds cool