[Q] blue tooth issues and a couple of questions topic

not sure if this is a gear fit problem or phone. I got a gear fit for Christmas present. I have a s5 active I also use my radio in the car as my hands free. today while in the car when I received a phone call /made a call the radio showed the call but i could not hear the other person nor could they hear me. until i turned on the speaker on the phone. has anyone had this problem and how to solve this issue need hands free while driving.

question #1 i have gmail account at work is there a way to add that to the email on the watch?

question #2 can you swim with the gear fit on?

thanks in advance for the help