if you answer this number they will tell you that they are from microsoft support center.
they will try to convince you that your pc is sending them error messages and try to get you to pay them and give them access to your pc. they will give you 347-332-1135 as a call back number if you tell them that you have to think about it. this is a scam and your pc will be hacked if you let them.
look at the thread for the 347 332-1135 number to get more info