First, start by opening your settings menu and finding the “Backup and Reset” option near the bottom of your settings list. If you’ve tried all of the above steps and your phone still isn’t able to send or receive phone calls, you can try resetting several of your settings back to their default modes. You should also disable “Block anonymous calls” for the time being, if you have it enabled, to see if the person trying to reach you can get through once the option is disabled. Make sure you haven’t accidentally blocked a number you’re trying to reachl if you have, tap the delete icon on the right of the display to remove the number from the list, and try to call that person again. Tap the triple-dotted menu button in the top-right of the display and select “Settings.” Under the “Call Settings” category, you’ll see “Block numbers” listed as the first option tap the menu to proceed to the next display. Head into your call settings by opening your Phone application from your app drawer. Once you’ve disabled Do-Not-Disturb mode, your phone will once again alert you when you have an incoming call.
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Make sure your Do-Not-Disturb mode is grayed out and disabled if it’s lit up, click the icon to disable it. To make sure your phone is set to allow phone calls, slide down your notification tray to reveal the quick-settings menu. It might sound silly, but leaving your phone on Do-Not-Disturb mode will create problems alerting you to incoming calls. Make Sure Your Phone Isn’t On Do-Not-Disturb Otherwise, let’s continue troubleshooting your device for call-related issues. Luckily, we have guides for both fixing your network problems and for fixing your SMS issues, so head on over to our respective guides for each of those issues. If you’re experiencing other problems-like you can’t place a phone call, or use your data-you may have a different, network related problem on your hands. If everything on your phone is working except for your calls, we can move forward. If you haven’t already, disable your WiFi (if you’re currently connected to WiFi) and try to send a text message or do a quick Google search on your device. If you’re experiencing problems placing or receiving calls on your device, we should make sure those issues don’t include network-related problems as well. After these settings are disabled, try once more to place or receive a phone call. On my Verizon model, WiFi calling is under “Advanced Calling.” You can then turn off both HD Voice and WiFi calling from this menu. Though these settings are located in several different settings locations based on your carrier, it should be under the “Wireless and Networks” category in your S7’s settings menu.
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If you’ve enabled WiFi calling or HD calling on your phone, disable one or both and try to place a call over your mobile network.Though uncommon, it could be causing problems with your own phone calls. You should also disable or uninstall any applications you’re using that modify your calls, including Caller ID or call blocking apps. It’s possible a bug with your choice of dialer app has caused a problem with placing calls that won’t be there with the standard application. If you’re using a third-party dialer, switch back to the stock Samsung Phone and Contacts applications.
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Select “Storage,” then press “Clear Cache” to reset the app. Just head into Settings, scroll down to the “Apps” menu, and select “Application manager.” Once your apps list loads, find the “Contacts” application. While the two applications do have different functions, they also have several functions tied together.