I won't be switching to this. I've been paying €4.99 monthly for Blokada VPN on Android. It's pretty reliable and offers ad blocking as well. Also supports up to 5 devices.
Any point's for 'Blokada' being more trustworthy than AT&T ;)
Blokada is pretty popular for Ad blocking on Android. And it's open source too: https://github.com/blokadaorg/blokada