LOL… I’m by no means an expert, just an enthusiastic Jitser.
Are you having this issue on the public instance at meet.jit.si or on your self-hosted Jitsi?
For the echo issue, you can try enabling echo cancellation and see if that helps. If you have a self-hosted Jitsi, add the following to your config.js file:
If you’re using the public Jitsi at meet.jit.si, you can add this as a URL param
You of course also want to make sure there’s no mechanical interference causing the echo e.g. meeting opened in multiple browsers on the same equipment, multiple equipment in close range without using headphones e.t.c…
Check the settings in your mobile browser to ensure permissions are granted for your mic. So, on your phone, go to apps (in the case of android), look for your browser name, then check its permissions to make sure it allows access to your microphone.