cell phone not connecting to wifi but PC does connect

When I went t turn on wifi on phone got message "Internet May Not Be Available." Worked fine two days ago. I can access the Internet from my laptop.

Tried resetting phone, resetting modem/router,  AI Assistant chat which did some diagnostic tests and found the connection good. Message was that some other stuff would be tried and to look for a text reply in 2 hours. 

If I have to have a technician will there be a charge for that?

I have a pretty old cell phone but never had a problem getting wifi on it until two days ago. HELP!