Why is there a delay when using NumberLink on my device?

NumberLink should work nearly instantly if both devices have a good data connection. However, some devices try to aggressively save battery by limiting how often services can perform actions in the background. This is a more common occurrence on budget devices.

 Here are some general suggestions that should work for most Android devices:

1. Make sure battery optimization is set to "Unrestricted" or "Not optimized" for the NumberLink app.

2. Turn off Battery Saver, if enabled.

3. Turn off Battery Manager, if enabled.
4. Check if your device is listed here for any further tips: Don’t kill my app!