how to I set iPhone SE and 7 to stop using cellular data after 1GB? (or whatever amount I choose?) I'm new to iPhones and just got those two phones. On my daily driver, the Galaxy S7 edge or other Android phones I've owned, all I had to do was to specify the number of MB's before the cellular data would be cut off in the settings menu. Can't seem to find something like this on my new iPhones. Thanks!