tl:dr; Which apps under the iPad Settings|Cellular Data|Use Cellular Data For list must be active to use Square Register. The app is not listed as an option to "enable" cell data.
details:
I am setting up a remote terminal for an organzation which does field work literally *in a field*. We take fees and donations and would like to use a low-data/low cost SIM in an iPad to accept the payments. We can get a SIM for free which allows 1MB/month (which is more than enough for the 20-30 transactions we would accept). BUT - if the iPad is allowed to use any other data services, like Find My iPhone or the iTunes Store, it will chew up all the data in a matter of seconds (even SquareUp's home page takes over 2MB of data to load).
I've looked in the Cell Data switches and SquareUp isn't one of the options for apps that can use Cell data, so I'm guessing(?) that it's using Safari or ??? as a conduit for sending the payment data and Register UI updates. We tried to get it running for about 2 hours this past weekend and ended up giving up. (we had told people in advance to be prepared with cash/check, so it was all good, but we have a lot of college students who usually have nothing but CCs and mobile/NFC payment options). Any help would be greatly appreciated!
