Unknown number to us. calls but leaves no message.

Got a call on landline from 1-234-542-5114 Thurs 9/13/12 @4:26pm from Akron, Oh. Was not home so ph was not answered, but on CID &  they'd hung up before ans. mach. picked up. As far as I know this is the 1st from this #, but my ph BLOCKER is full of other telemarketers, political, & private, unknown etc. callers so it may have called a while back. Never the less, it only takes that 1st caller to get your ph # & it gets sold to others & it gets spread around like flies multiplying. We will never truly get left alone again. And at 80 yrs of age they are ruining what time I have left on this earth.