Samsung Galaxy S21 Ultra

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It's not possible to use Wi-Fi calling

Solution 2 of 4: Your phone needs to be restarted

If your phone is slow or freezes, it might help to restart it.

Step 1 of 2

Press the Side key.

Step 2 of 2

Simultaneously, press and hold the lower part of the Volume key and keep them both pressed until your phone restarts.

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