Texting is the only mobile marketing medium that can reach both smartphone and regular mobile phone users. And, while the Internet is expanding globally, satellite telephone connections seem to be more universal and more reliable than Internet connections. Therefore, text messaging has the widest reach globally compared to any other mobile marketing channel.
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.