[zokier]

Well, I wouldn't call it trivial, but it's not completely outlandish idea. There is prior art in this Ringo kit, which does almost 90% of what's required here: https://github.com/CircuitMess/CircuitMess-Ringo

[beretguy]

I still have it, haven't put it together yet. I've heard it doesn't actually work with carriers.