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Wi-Fi Calling preferences are set to Cellular Preferred or Cellular Only to prevent Wi-Fi Calling issues with interfering with your signal.
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If you have Family Allowances, make sure it isn't blocking calls or has time-of-day blocks set up. Your line is active (prepaid lines must have a balance). Check out Signal issues / no service troubleshooting. If there are fewer, the signal is too low for reliable calls. Your device shows at least two signal bars. To make sure your device can make and receive calls, check the following:
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