no message - most likely an auto dialer program from a collection agency. Line busy when you call back. If you answer, you will probably get an "important message".
calls often it is most likely a collection agency trying to scare and scam you out of your money! they never answer when you pickup! fyi I don't owe any debt so why are they allowed to computer auto dial people's phones! telemarketers aren't allowed so why are they allowed to call it is the same with those so called "survey" and "charities" they sell your number and they wonder why you answer rudely when they keep calling after you politely ask on the first time to have your number removed from their lists!
to "wantstokillthemalot". i work for a "survey" company and we get numbers from computer generation or from the client wanting the survey and YOU gave them your contact information. remember to be sure and tell them specifically you do not want to be contacted for market research! we also don't sell your numbers when we are through. they are only used to contact you and then when the answers are aggregated they are disposed of.
i got this call on 8-28. no msg.