And a useful advice — take your phone contact list and TYPE their names and phone numbers into your computer, then print it out and keep it in a safe place, just in case.
Many people only have their contact list in their mobile phone and if something happens to it, they lose it all.
It’s better to have it and not need it, than the other way around.
Use google contacts and import them there - in case a backup is needed, you can just re-sync your device.