All about not reinventing the wheel and saving money
A typical military personal 2-way radio costs thousands, gobbles batteries and is often incompatible with co-operating forces - the U.S. invariably chooses complex designs which others strive to emulate.
Adopting smartphone & cell type technology is so stupidly sensible.
Total interoperability between all forces; only need to download info for a given task; provides audio, video and data output; cheap; disposable; can be solar powered.
It reminds me of WW2. Tanks had a typical working life of 6 months before destruction. The Allies used mass produced tanks and vehicles along the lines of Ford production. The Germans, on the other hand, used mechanically advanced engines and tanks, along the Mercedes principles.
Guess what? The easiest to field repair were the Allied vehicles: cheap and nasty - could be repaired using local supplies.The German vehicles, though, required precision parts and garage servicing.