If you are on the DNC, report the call on the FTC.gov website. We report calls to our landline, but haven't added our cells, as we don't want to give charities & politicians the ability to call us, since they are exempt from the DNC. For our cells, we don't answer, look them up, and if it's a sales weasel or lawyer-trolling, we just add them to the contacts as "spam", "crap", etc., and we know not to answer and just hang up on them so they can't leave a message.