How do you pay for jmp.chat? Do you trust their code to be bug-free and without possible exploits? Do they do regular security audits and code reviews? Do they have enough users and maintainers to be able to quickly detect and address security issues? Are you sure Airplane Mode turns off the baseband and cuts off all cellular communication? It doesn't, you can still emergency receive alerts in Airplane Mode. Your phone can tell exactly where you are by comparing your wifi search results + RSSIs to known public databases without even having to use GPS. How much do you trust your VPN provider to keep no logs? How do you pay for VPN?