What is this notification?

[Sammynacoletharpe]

The notification before it said something about syncing sim contacts

 

[Brian706]

It's a system app probably related to messenger or contacts. FCM is firebase cloud messaging.

 

[Sammynacoletharpe]

It's a system app probably related to messenger or contacts. FCM is firebase cloud messaging.

What is this firebase cloud messaging used for I've heard of it before

 

[Brian706]

I don't know much about it. I think people can put it into their apps so that apps can send push notifications, etc. I'm definitely not a developer, so just kind of giving my best guess here.