Apple’s FaceTime app for iPhone (and other IOS devices) is sufficiently popular that “facetiming” has become something of a generic term for video chatting.
The closest thing Android has to a default (meaning it may already be on your phone) video chatting app is Google Duo.
Another popular option is the venerable Skype.
If you’re on Facebook, you might consider Facebook Messenger.
The great thing about these apps is all are avaialble on iOS as well as Android, so you’ll be able to video chat with friends still using iPhones (with the caveat they use the same app you’re using).