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How to reject a phone call?
Android:
1. To automatically reject calls from a particular number, from the same number( 902, 901, etc.) or unknown, go to Settings > Device > Calls > Call rejection > Call rejection list. In Auto Reject Mode, you can turn the filter on or off.
2. To block a number or contact for a few hours, go to Settings > Device > Block Mode.
3. To reject SMS, go to Settings > More > Junk Mail Settings and add the numbers whose messages you want to bloc.
iPhone:
1. Go to Settings > Phone > Blocked Contacts and enter the contact or a list of contacts to automatically reject all calls. The same goes for messages. 2. If you go to Settings > Messages > Blocked Contacts. 3. Just like on Android, you can turn on iOS Do Not Disturb Mode to automatically reject calls from a contact or list for a few hours. To reject these calls you only have to enter the numbers in Settings > Do Not Disturb.
4. If the phone is locked or at rest, you can reject the calls by pressing the " Home " button twice; and if at the time of receiving the call you have the earphones on because you do not want to answer, you just have to press the microphone button for a few seconds.
Windows Phone:
1. Go to Settings > System > Call Blocker and enter the numbers or contacts to which you want to reject the calls.
If you do all this, you can block calls and messages from all the numbers or contacts you want without the need to install more applications on your smartphone. That yes, after rejecting automatically, the calls and messages of these contacts cannot be retrieved. If you just want to reject the call but also want to keep it, you can block notifications so they do not ring and do not bother you.