Yes, an activity tracker watch can provide notifications for calls and messages. Many activity tracker watches have built-in features that allow them to be synced with a smartphone. Once the watch is connected to a smartphone through Bluetooth, it can receive notifications such as incoming calls, text messages, and app notifications. These notifications are typically displayed on the screen of the activity tracker watch, allowing the wearer to see who is calling or messaging without needing to check their phone. Additionally, some activity tracker watches also offer the option to reject or answer calls through the watch itself. However, it’s important to note that the availability of these features may vary depending on the specific model and brand of the activity tracker watch.