Still had poor reception after getting the SIM card replaced. Just swapped out the board with the antenna on it, won't know until my commute if it will help.
...with a brand new ****ty radio. So, with that in mind, I think swapping out the phone will be your best bet. Keep us updated if you do get a new phone, and what the outcome is. Because if it does make a big difference, I may call Asurion and tell them to send me another one as well. I'm sure it'll be another refurb, but finally being able to keep a steady signal again is well worth the trade off.
Edit: Oh yeah, I forgot to mention I've tried the swapping of the sim with mine as well, didn't help me at all either.