Does not work abroad

I purchased gps4cam app for a trip to Colombia because one of its features was that it did not need the network. It worked great in the US but when i put airplane mode on my iphone it does not work. I also removed the simm from the iphone and it does not work either, it does not get a single location. I have a 4G iphone.

MarioU2012 about gps4cam - Geotag Your Photos, v6.0.2