Source your contact numbers morally

Maybe the main run for all instant message advertising exercises and crusades is that you should source your numbers morally. Is this a best practice as well as it's a lawful necessity. Contingent upon where your organization is found and to whom you are advertising to, you should take after the principles of your area. For those in the US, that implies following the CAN-SPAM Act. For those in the EU that implies following FEDMA. (Swedes can check their tenets and rules over at SWEDMA).