If you've turned on notifications in the Osper app but aren't receiving them, you may need to adjust your phone's settings.
Android
- Open your phone's settings.
- Scroll down and tap App - Osper.
- Select the option to show notifications.
iOS
- Open your iPhone's settings app, scroll down and tap Notifications.
- Tap Osper, then turn on the settings to Allow Notifications.
Click below for more information on Google and Apple support
https://support.google.com/nexus/answer/6111294?hl=en-GB
https://support.apple.com/en-gb/HT201925