I can't answer #1 but I can try with #2 and #3.
SAR is measuring the RF transmit level to make sure it's not damaging to the human. It has nothing to do with the reception.
There are other phones beside enV that can also do e-mail and GPS. There are monthly fees associated with these services so not so good for a light user. They do offer $1/day mobile web and $2.99/day GPS service.
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