Apple Watch SE 3 GPS Cellular 40mm Midnight Sport Band

Press and hold the band release button, then slide the band sideways to remove it. Slide the new band in until you hear a click.

The Apple Watch SE 3 is water-resistant up to 50 meters. It can be used for shallow-water activities like swimming in a pool or the ocean. However, it is not suitable for scuba diving, waterskiing, or other high-velocity water activities.

Ensure your watch is charging, connected to Wi-Fi, and near your iPhone. Open the Watch app on your iPhone, go to General > Software Update, and follow the instructions.

Open the Settings app on your watch, tap General > Reset > Erase All Content and Settings. This will erase all data from the watch.

Contact Apple Support or take your watch to an Apple Store or authorized service provider to get it repaired.

Yes, all models of the Apple Watch SE 3 have built-in GPS.

No, the Apple Watch SE 3 is only compatible with iPhones.

Ensure the watch is charged. If it still doesn't turn on, try a hard reset by holding both the side button and the Digital Crown for at least 10 seconds until the Apple logo appears.

Check the notification settings in the Watch app on your iPhone. Ensure notifications for the relevant apps are enabled and that Do Not Disturb mode isn't on.

Check your usage patterns and disable features that consume a lot of battery. Reduce screen brightness, turn off the Always-On display, and limit background app refresh.

Make sure Bluetooth is enabled on your iPhone and the watch is within range. Restart both devices and ensure both the watch and iPhone have the latest software updates.

Ensure the watch fits snugly on your wrist. Clean the back of the watch to remove any debris that might interfere with the sensor. Make sure the watch is positioned correctly on your wrist.