It's been awhile but I never had an issue sending text (SMS) messages to non iphone users. You just need to enable the device whether it is a macbook or an ipad on the phone itself.
I actually see no real use for the phone mirroring. It has been available in other ways for years and I just see no practical reason to use it. Maybe there is an app you can't get otherwise on a computer but I don't use them.
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