Great question! I believe I can help clear this up for you.
You are going to need to have two separate lines for the devices to function correctly.
As far as plans, you’ve got two options which both cost $10/month for each line. The first option is our Smart Locator Stand Alone plan or you can choose to add the watches to your existing mobile share plan.
If you need any further assistance, you can check this page.
I hope this information covers what you were looking for. Enjoy the rest of your day!
Larry, AT&T Community Specialist
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