Call came up as Toll Free Call. As soon as I said hello, caller hung up.

caller id was FRONTIER. phone rang twice and hung up without leaving a message.

They hung up when I answered.

When I receive these kinds of calls I save them as a New Contact in my cell phone.  For the name I put "Do Not Answer".  Next time they call I don't answer.  If you use this system just as 1 , 2 ,3, , 4  etc after the first "Do Not Answer" if you have other companies doing the same thing.  I have at least 7 of these on my cell.

Whoever this is hangs up as soon as I answer.

Called and left no message.

Called and identified themselves as Frontier but came up unavailable on caller id.  No personal info was given, but the call was abrubptly ended when they were questioned about their company.

instant hangup - multiple calls, and every time i say hello they hang up >:O

Frontier appears to be another telemarketing company.

Frontier is the company that took over/bought out Verizon local land lines.

November 8.  I have been receiving calls from this number and the caller ID list "Unavailable".  I never answer calls that do not either leave a message or identify calling source.

I just got a call from this number also and they didn't leave a message. It is 8:45 at night here. I think that's a little late to be calling.

they never leave a msg for me either - but in searching online, I think it is for old verizon customers (it is now Frontier), but I don't know what they want.