4s or 5 should be based on the availability of the 4 G network in your area, I am upgrading my 4 to 4s only as I don't see the 4G network any time soon around here West of Ireland, and also on the basis that with the 4s I do not need to upgrade my Media cradle in my car, I am also not too keen on the large screens, but then again I am office based hence not important for me, not the case if you constantly on the move.
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