Numbersync Question

I was trying to set up my new Galaxy Gear S2 with NumberSync.  I'm getting the "SIM not provisioned" message. 
I tried to use the activate device on the web page, but it only gives me the option to add a line or replace an existing device. 

Do I have to add a line to use this feature?  This is a glaring omission in all the marketing if so. 

Thank you.