VPN services like Nord and Proton have quickly grown into full privacy and security suites, while Mullvad is more focused on making a robust VPN. Unfortunately for PIA, it had much slower speeds than any of the other VPN services I tested, so regardless of ownership, it isn’t a top pick for iPhone VPNs. How We TestedTo earn the best iPhone VPN title, a service needs to satisfy three criteria. The numbers I gathered for this guide are the result of 20 tests I ran for each VPN, then averaged. I tested five locations for each VPN, measuring my unprotected speed immediately before testing and running three passes before averaging.