Satellite phones utilise satellites to communicate with landline, cellular, or other satellite phones in most regions of the world, and are often useful during emergency situations.
Do Satphones Work Everywhere? International Satellite Services Inc.
Satellite Messengers - When the Phone has No Service - TrailMeister
Satellite Phone How satphone works ?
How does your mobile phone work?
What Is a Cell Tower and How Does a Cell Tower Work?
Use Emergency SOS via satellite on your iPhone - Apple Support
Functioning/Working Of Satellite Phone
Satellite phone - Wikipedia
Everything That You Need to Know About a Satellite Phone