If you're on a call and your other line shows No Service, either your provider doesn't support Wi-Fi calling or you don't have Wi-Fi calling turned on. When you're on a call using a line that isn't your designated line for mobile data, you need to turn on Allow Mobile Data Switching to receive calls from your other line. If you ignore the call and you have voicemail set up with your provider, you’ll get a missed-call notification and the call will go to voicemail. Check with your provider for Wi-Fi calling availability, and find out if additional fees or data usage from your data provider will apply. With iOS 13 and later, when you're on a call, if the network provider for your other phone number supports Wi-Fi calling, you can answer incoming calls on your other number.
You can make and receive phone calls with either phone number.
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