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In simple language, the Operating System [OS] is nothing but the software infrastructure build by programming components by which your hardware could work more efficiently.
And the common mobile Operating System [Mobile OS] is the OS specially designed for mobile devices to run all the Mobile Functions on the compact hardware of that device.
Requires Personal Hotspot service through your carrier.
Supported by Mac models introduced in mid 2013 or later.
Requires a broadband Internet connection and microphone (built-in or external). Force Touch gestures require a Force Touch trackpad.
Voice Over gestures require a Multi-Touch trackpad, Force Touch trackpad, or Magic Trackpad.
Mobile Operating Systems - Modern technology transformed those phones into smartphones and we can now say that; they are much closer to handheld computers which give you features like listening music, sending emails, watching movies, playing games and much more including face-to-face video calls.There are so many reasons to upgrade to mac OS High Sierra now.