Scam
When answering it's a recorded message wanting to tell you how to make $10,000.00 right away.

This phone number just called me. I answered the phone and nobody said anything. Then they hung up. I don't know who this is. Very frustrated!!!

I've been the subject of cyberattacks/hacking (don't know the difference) for FOUR + years  and, about 95% sure I know who it is.  But each time I end a personal phone call; within 1-5 minutes later I get a call, usually VOIP.  I only recently started answering them thinking before that they could be triggering a switch in the IOS software.

Yes, she also used third party  authentication software to gain access to my accounts & get in to the developer mode to modify or create software in settings. So,  everything is shared with her on my phone a lot is created to be hidden & her ip is outsourced through hubs throughput the world.

She started by hacking my Xbox that went with ex-husband in divorce (so she had it----all she needed was to hack my email, mii character etc...... and she remotely accessed my router, printers, computer, laptop, iPhone. Additionally achieved by installed a "iPhone printer" on my daughters iPhone,

But she/hacker has never had physical access to my phone.

AS EVERYONE SAYS CYBERCRIME IS HARD TO PROVE.  So, I pray, stay positive, and know she will have a judgement one day greater than mine.  I pray that people having to deal with these types of situations find the right people and support to help them.  I'm still trying.  And I know this can't last forever.  Before I finished this I had three more calls.