To set up AT&T basic voicemail, from the clock screen press the Power/Home button. Note:NumberSync must be enabled in order to use Voicemail on the device. When NumberSync is enabled, calls to the primary device will be routed to the primary voicemail box. These instructions will set up your Galaxy Watch's voicemail box. To set up your phone's voicemail box, access your voicemail box by selecting and holding the 1 key from your phone.
Rotate the bezel to and select the Phone icon.
Select the Keyboard icon.
Select and hold the 1 key then follow the phone prompts to set up voicemail. Note: View Access AT&T Basic Voicemail for tips to manage your voicemail. Go to Troubleshoot Voicemail for solutions to common voicemail problems.