I’m using 4G by China Mobile, but the DNS it provides really sucks. Changing DNS from Cellular Data on a not-jailbroken iPhone is impossible so far as I know (I tried mobileconfig but can find any working options).
The first idea is pushing DNS from a PPTP server, which I wrote: Notes: PPTP/L2TP Server on Ubuntu.
I can create two connections on my iOS, one set default route, one not. All users share a same setting from PPTPd, it’s almost impossible if I want to use a different DNS in these two connections, changing default pptp port from 1723 to others is not as easy as it is on windows.
Don’t forget that PPTP is what GF*W likes.
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