Or I can just turn on internet sharing with my gf and get what we want.
A stupidly annoying process but sometimes warranted.
The iPhone used to have the same issue, I'd guess it's a carrier forced limit.
I would guess it is somewhere in the carrier agreement as well, especially with folks on certain providers holding on to grandfathered unlimited data, and now with LTE speeds rolling out more and more I am assuming the carrier is trying to nudge heavy users on a WiFi network or tethering device so they can hit you with another charge.
You guys are just wrong on this.
MS removed the 20MB cap (and dev documentation) on this last year. It is (and has been) <50MB now for some time (at least on WP8). Will do a post to clarify.
Why cant we download over 20MB from marketplace with our data connection, why it requires a wifi?