One of the best features that every Apple unit has is iMessage.
This Apple messaging platform is entirely free.
All you oughta do is ensure youre connected to the Internet.
After these steps, you will also see the synchronization notification on the other machine.
Moreover, you should peek if youre logged into your Mac and iOS unit with the same Apple ID.
Youll also need to ensure that syncing is enabled on your iPhone.
confirm that both the phone number and email address are checked.
Remember that for everything to work and sync correctly, you should always keep your devices up to date.