If you plan to use your gear S on standalone (Watch number) try not to use apps that will count against your data. think of it as a house phone. Sprint will suspend the gear S line if you go over your minutes/text or data even.
I have my GV set up to ask how I want to make the call ie calling someone do you want watch number to show up or do you want GV number to show up when you make this call/ You could also set GV to always call out this number