Here’s a map of 14 different wifi locations among Mecklenburg County’s Parks and Recreation facilities. These are better than some of the commercial locations because you can linger there. And linger long enough to use wifi calling to make phone calls.
The GREEN wifi symbols are parks and the BLUE wifi symbols are Rec centers.

Help your friends on the street find these hotspots better by leaving a comment below that narrows down the best signal location inside these sites. I will take your comment and add it to the page.