REQUEST FROM YOUR EXISTING CLIENTS : Charity they say begins at home. The best place therefore to start your SMS marketing campaign is with your present clients. Many businesses that own a website request their client to provide their phone number while registering on the site. Others ask them for it when they are ready for their SMS marketing campaign. You mustn’t necessarily go directly requesting for it. You might tell them you can offer updates about new products and services and promo information through text message. It is very unlikely that many clients will object to this.
Once you've collected your mobile numbers, verified that you have followed all of your legal responsibilities you can start your SMS marketing campaign. I'd suggest using a 3rd party service provider to ensure that you are able to track the return on investment for your campaign, embed an unsubscribe message, and easily manage your SMS marketing database including unsubscribes.