Who called from 2348151308

234-815-1308 called me twice today. I will block them

Calls all the time about "free security system" or "about my credit card" ..don't have a credit card either

They call all day long

I missed the call - I m glad I did!

Got a call from 234-815-1308.  Answered it. Got no response.  Just heard a "blip" then the call terminated.  What are they attempting to scam me out of if they don't even talk?  Are they hacking info form my phone memory?  Can anyone answer these questions?