DNS blocking on mobile networks?
DNS can be changed with apps like "Set DNS" and with the setprop command, however all fail on KitKat to modify resolvers ONLY IN CASE they were set by the mobile carrier.

An simple solutions was given at:
How to change mobile connections&#39;s DNS on Android KitKat?
(in brief: put imgur's IP's in /etc/hosts)

It will work, but myself, I'm still hunting a way to modify the carrier's resolvers.