A No Caller ID keeps calling me. What should I do?

So around like 2:00 or 3:00 am some no caller id number keeps calling me and when my phone rings it wakes me up. Then I ll check my phone and it says that they called me like around 2 or 3 times. I ll get so annoyed so I end up fully shutting off my phone. When I answer ( I rarely do) I ll say "hello?" And they won't say one word, they usually hang up right away. This has been happening every other night for like the past month and a half. So is there any way I can find out who's calling me? Or how can I block no caller id numbers? I have an iPhone 5s if that helps… Thanks

I think you can call your phone company and ask them to block, anonymous callers.

1) Unplug or turn of your phone at night.

2) Get call blocking on your number from the phone company. Also, some cordless phones can simply not allow anonymous calls through.

2) Call your phone service provider and ask them how you initiate a caller originated trace (COT). That will be some *NN code that will attempt to trace the number and write a record that the phone company (not you) can monitor.

3) That COT data can be used in a case to prosecute the caller.

Try a "star code"
https://www.verizon.com/...+codes.htm

Or check these. May need to call your phone company.
https://www.att.com/.../KM1010645
http://www.centurylink.com/help/?assetid=183
http://support.brighthouse.com/Category/Anonymous-Call-Reject/
http://electronics.howstuffworks.com/blocking-incoming-call1.htm
https://www.windstream.com/Support/How-do-I-block-calls--What-is-Selective-Call-Rejection-/

It's me. You have won a prize for a competition you never entered. Just have your credit card ready when I call so we can load your winnings on to it.

Don't answer.