Cras

Firefox, Chrome, Edge, will all warn you about self-signed certs or cert mismatches but allow you to continue. You’re completely correct that SSL/TLS needs a certificate, but it doesn’t need to be CA issued or in any way legitimate for the encrypted tunnel to be established

You don’t really ‘need to’ in a world where a good proportion of people will happily click ‘continue anyway’ when they get any sort of certificate error

Proton shilling on Lemmy is huge business. I have nothing to say one way or the other on the products but it really puts me off.

Valid, but if you get a dedicated one, you could put in a SIM from a different network that has better coverage, if one exists

A cellular signal isn’t one single thing. A GSM booster will improve the availability of a GSM signal, but that’s calls and SMS but isn’t going to do a lot to provide mobile data given that 3G coverage is basically dead and 4/5G data doesn’t operate on a frequency that the GSM booster will be doing anything for. You can get cellular WiFi hotspots that you put a SIM in and they basically become your WiFi router or just use a cellphone that has hotspot functionality