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An operating system is the software that runs on a phone or tablet.
Most smartphones and tablets have the ability to access an operating system from the Settings menu.
There are also apps that you can download to run on the device.
Here are the best free Android operating systems that you may want to consider using for your next phone.
Read more: How to make the best Android phone: Top 10 Android phones, top 10 tablets, top 11 phones