Until Apple release a bigger phone and then it will be the best thing yet, a major leap forward the critics will say. We all know Apple will do it so all the Apple fans may as well admit now that a bigger screen has some pretty obvious benefits.
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They have a better invention for those struggling with iPhone screen size...
It's called Glasses :D
You can get an external antenna albeit as part of an in car kit.
When I working on water projects I had one in the D3.
It had very good coverage & I could get thru when the hand helds had no signal.
Even got coverage from on top of MT Skene on a snow trip.
Solves your battery problem as the phone is in the cradle charging.
From memory it was a Bury Communications kit.
Cheers