Mobile browsers rarely expose full developer tools. The most dependable route is remote inspection from a desktop browser.
Android and Chrome
- Enable Developer options and USB debugging.
- Connect by cable and accept the authorization prompt.
- Open
chrome://inspecton desktop Chrome. - Locate the mobile tab and choose Inspect.
Without a computer, a temporary in-page error panel can help on a test build. Never expose tokens, cookies or user input in production diagnostics.
Leave a useful record
Record the step that actually fixed it, the device or browser version, and any temporary changes you reverted. That note is often more useful than another bookmark.