If you want to make or receive calls from your iPad logged into the same iCloud account, view this info.
Notes:
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You can use the wireless account from your iPhone to make and receive calls on other Apple devices logged into the same iCloud account.
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Verify that you have the latest software version and your iPad has been added as a companion device.
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View the Wi-Fi calling support page for additional info.
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From the Home screen, tap FaceTime.
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Tap Audio.
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Enter a contact or phone number then tap the Phone icon.