I use an SGS3 in an Brodit Active mount to the right of the steering column - it looks OK, charges the phone & has the advantage of being easily accessible if I receive an email etc and I've never had any problems with reception, but I would use an armrest mount if someone decides to make one.
I'm sure something like the brodit mount could be adapted for the armrest if it's possible to get an adaptor lead from the armrest connector to a micro USB lead
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