I fly on a cell phone without a SIM card. Basically, if you haven't logged-in in the last 30 days, your flights are limited quite a lot. You can only fly so far

I fly on a cell phone without a SIM card. Basically, if you haven't logged-in in the last 30 days, your flights are limited quite a lot. You can only fly so far (100ft?), and so high. I just make sure to log in and get all firmware/map updates over WiFi before I leave on trips and have been fine.