Samsung SCH-A670

I was wondering if both of these work because my signal isn't all that great around my house. It varies from time to time 0-3 bars the most around my area... and yeah 50 bucks just for a bluetooth is a big pricy but it comes in handy. I lost my other earpiece which sucks because this phone gets kinda hot when you hold it or talk on the phone pretty long.

So yeah if anybody tried the bluetooth or the signal boost a girl over here is in some definite need of better signal.