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Jul 13, 2015 1:13 PM in response to Amr_707by sterling r,Hello Amr_707,
If I understand correctly your phone app is closing unexpectedly when you're either entering a phone number or on a call. I would quit the Phone app first:
1. Press the Home button two times quickly. You'll see small previews of your recently used apps.
2. Swipe left to find the app you want to close.
3. Swipe up on the app's preview to close it.
When you have done that restart the device and test the issue again:iOS: Turning off and on (restarting) and resetting
If the issue persists then I would use these steps from the following article about issues making phone calls:
If you can't make or receive calls on your iPhone
Update your software
- Check for a carrier settings update.
- Check for an iOS software update. Some updates might require a Wi-Fi connection.
Remove and reinsert your SIM card
If your iPhone has a SIM card, remove the SIM card, then reinsert it.
Contact your carrier
When you contact your carrier, check the following:
- Your account is set up to use your iPhone.
- There aren't any localized service outages.
- Your account doesn't have a billing-related block.
- Your calls don't have errors on the carrier system.
Check your network settings
- Reset your network settings. Tap Settings > General > Reset > Reset Network Settings. This will erase all current saved settings, including Wi-Fi passwords, preferred networks, and VPN settings.
- Try to make or receive calls in another location.
- Switch to a different network band. Tap Settings > Cellular and turn off Enable LTE, 4G, or 3G (this option will depend on your carrier and device model).
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