Another option to disable cellular data would be to use something like FakeAPN app which changes the cellular data server settings on the iPhone so that it won't go through:
FakeAPN for iPhone:
http://www.unlockit.co.nz/unlockit/
How to video:
http://youtu.be/na-3qc36R7s
A similar app for the Android would be APN Switch:
https://play.google.com/store/apps/d...roid.apnswitch
What they do is just a simple toggle on/off switch that adds some jargon at the end of the APN server settings so that cellular data can't go through.
For example, for T-Mobile USA, the APN server settings is something like "xxx.tmobile.com." When the APN Switch app is toggled on, it changes the APN server settings to "xxx.tmobile.comapndroid." Since the server settings are wrong, no data gets through. If you want to use data again, just toggle back off the APN Switch app.
Originally Posted by
Mountain Trader
Going to Network and turning off Cellular Data would seem to work, assuming that it leaves the IPhone still capable of processing GPS signals. Is that the case?
If you want to test if the GPS still works with the cell data off, just download a run of the mill free GPS compass app like
Free GPS
If it shows you your current location in longitudinal and latitudinal coordinates, then you know you're just receiving GPS signals without cell data.