said by EamonX1 :
I know of four different Wi-Fi locations (and signals) where I could connect easily before. I cannot connect to any of these now.
Seems like the problem is with the phone and not your 2wire WiFI. Suggest you call Apple support.
FYI, I had a similar issue once and it turned out there was a setting that got turned off. Not sure which or what it was though, but support found it quickly.