Can Cell Phones be (legally) used Adhoc, (ie, Point-to-Point) Communication? For example, let's say I'm in a remote area of the woods, or a valley. Can I configure cell phones to be used as true walkie-talkies even though neither one of them use has a cell phone tower?
(Besides, it might be handy to use this on, oh, say, a drone, for photography purposes. I intend to comply with all regulations regarding use of my drone.)
This goes for those modules too, I can hook them up to a raspberry pi, for example. 
In the latter case I could just buy a nice antenna, I guess....
What kind of range would either of these things have if they are feasible?
I wanted to get my ham radio license, but I have my second year of engineering school to finish up.
Also: Might you suggest any alternatives (I hope this doesn't make my askance too open- but, it may be worth noting this question, or moreover, it's very upvotable answer! Alas, I doubt they have too much bandwidth...)
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