Received several calls today and last week and after I answer, it hangs up.

When I answer, they hang up.

Keep getting calls from this number and when i answer they hang up. Is it a call centre?

Just got a call from this number as well, I'd say it's an auto dialler in a call centre.

It turned out to be a predictive dialer run by Dell. They rang today (and I did not hang up) and it was a follow up call to a purchase I made a couple of months back.

Would also like to know who this is.