NumberSync for wearables: Requires smartphone with AT&T HD Voice-enabled postpaid wireless service and compatible wearable on eligible wireless plan. Not available to business or government customers (for Corporate Responsibility User lines of service). For calls made outside the AT&T-owned and operated domestic coverage area, your wearable number rather than your smartphone number is shown as the calling number, even if it's been enabled for NumberSync.

Device limit: Sync up to 5 compatible wearables. Device selection is limited.

Charges: Domestic calls you make and receive on your wearable are subject to your wearable plan's standard calling rates, and count as talk minutes. International rates apply to international long distance calls.

Text or picture messages you send or receive using your wearable count as data, and data usage rates apply.

Roaming: Talk and data roaming rates under your wearable's current plan or international option apply when using NumberSync while roaming.

Other restrictions: Certain features aren't compatible with NumberSync. You can use NumberSync to send or receive multi-media messages (group, picture, or video messages) to international long-distance numbers. Get more info in the FAQs.