Go to Settings > Cellular. If your iPhone has Dual SIM, choose a line (below SIMs). Tap Wi-Fi Calling, then turn on Wi-Fi Calling on This iPhone. Enter or confirm your address for emergency services. Note: Emergency calls on your iPhone are routed through cellular service when available.
Update your iPhone or iPad wirelessly. Back up your device using iCloud or your computer. Plug your device into power and connect to the internet with Wi-Fi. Go to Settings > General, then tap Software Update. If you see more than one software update option available, choose the one that you want to install.
On your iPhone, open the Settings app. Tap General . Scroll to the bottom of the screen and tap Reset . Tap Reset Network Settings . If prompted, enter your passcode. Tap Reset Network Settings . Your iPhone resets its network settings and then restarts, which takes a minute or so. When you can use your phone again, enter your passcode.
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Update using your computer. Connect iPhone and your computer with a cable. Do one of the following: On a Mac (macOS 10.15 or later): In the Finder sidebar, select your iPhone, then click General at the top of the window. On a Mac (macOS 10.14 or earlier) or a Windows PC: Open the iTunes app, click the button resembling an iPhone near the top
Restart Your iPhone. Sometimes, all you need to do to fix the problem is simply restart your phone. Press and hold the power button, then swipe the red power icon from left to right to turn off your iPhone. If you have an iPhone with Face ID, press and hold the side button and either volume button, then swipe the power icon across the display.
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