Both, yealink for physical phones. Ground wire for mobile app. You could always sign up for a test number before you port yours over.

Voip.ms is great, been using them for businesses for years. It’s dirt cheap - probably cost you like $3/month.

Sorry I don’t.

Check this site for the most accurate weather provider in your area. Then choose an app that can use that as a source. https://www.forecastadvisor.com/