What to run
Open User-Agent Parser. It stays in the browser.
Open What Is My IP and IP Geolocation for the person on the phone. Those results are from Cloudflare.
How to read the result
Parser output is the ticket.
IP tools are the person on the phone, unless they pasted their IP too.
Do not merge them into one identity unless the ticket says so.
What to open next
Open HTTP Headers on the URL they hit, to see if the app redirects mobile. That result is from Cloudflare.