lots of call and never never leaves a message

File a complaint with the FCC.
Telemarketers cannot call cell phones, if you get one, file a complaint with the FCC.
Also, telemarketers cannot call after 10PM, if they do. File a complaint with the FCC.  I used to work at the FCC, and they do go after these telemarketers, but there has to be enough complaints filed. 100 complaints is enough to be referred to the Enforcement bureau for investigation, but a complaint has to be filed.  Go to http://esupport.fcc.gov/complaints.htm  and follow the prompts. Or call 1-888-225-5322 and ask to file a 1088 about telemarketers.

forgot to input the number ...
Caller ID - San Francisco CA - 4153635567

Never leave a message when the machine picks up. Getting ridiculous.

calls multiple times but leaves no message

lots of calls from them with no messages left