IPhone acting really strange?

My son and his friend both have an iPhone each. Last night at 1:40am thereabouts they both received an unknown call at the same time when they picked up it was them on the phone! It happened again but this time they ended up in a four way conversation with two other people. They are continuing to get the calls but are ignoring them as they are getting a but freaked out. Any idea of what is happening?

How about you bring the phone to the repair shop…

Group dial optioned prank calls. That's not the way robo-calls normally work. Someone is having some prank fun with your son and his friend. Just block the number. Also reverse lookup the digits to see if you get a hit. Best luck.

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