Who called from 9135533243

This number calls every 1-2 days for weeks now, only answered a few times, but there is never anyone there, the call stays on for about 10 seconds then hangs up.  Hacking attempt?

I get a call on my cell phone at least once a day from this number. I have never answered.

I have been getting calls from this number. Most of the time, it is once a day 2-3 days a week. A couple of times it was twice in one day. I don't answer numbers I don't recognize, so I haven't answered. They leave no message.