I have bought a new iPad mini. its not showing me Facetime Installed. How should I start a Facetime ?
Where did you buy it? facetime is barred from devices sold in some countries, due to the countries insisting upon it. UAE and other middle eastern countries are examples.
If you bought your iPad in a country that banns its use then you'll never have facetime on that device. It's locked out at the most basic level.
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