If you are using LifeSaver in the US, as you register your cell number during LifeSaver installation, you should see a pre-populated "1" for the country code. If that number is other than 1, your cell phone's region is set to the wrong country.
To set the region to the United States:
- Open Settings on your iPhone.
- Tap General.
- Tap Language & Region.
- Tap Region.
- Select United States.
When you enter your number into the LifeSaver app now, you will see the pre-populated "1".