How to stop random calls on my iPhone?

Without changing my number, How can I stop all of these random calls on my phone?

So one day I've bee expecting a call from someone, they were out of my area code, so the number area code was different from mine. I answered it just that one time! And then later on day I've gotten a couple of more calls that were random and out of my area code.

Ever since, I've been getting the most random numbers calling MY iPhone that it gotten to the point - two random numbers in a row would call me in the middle of class and leave me voicemails that last for 1-2 seconds.

I DON't LIKE THIS! Its getting annoying and annoying everyday, this never happened too me since that day a number called me out of my area code. Without me having to change me number how can I make it stop?

You don't. You have to decide what is important to you, making sure you get all calls, where only known numbers get through, or all numbers get through and you only answer those that you actually know.

You can set most phones to block all numbers that are not in your contact list, including people you know calling from unknown and private numbers. Or use a call blocking app that blocks all numbers not in your contacts, with the option to pick up and hang up, so that such numbers do not go to voicemail.

I block all numbers not in my contacts, which forces people I know to either unblock the number they are calling from or leave voice mail to let me know it's them calling from an unknown number and how to call them back if it's important.

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