There is no other method that comes close to SMS in terms of reach and reliability. And that goes for their open rates as well. Clients can easily skip over a social media or mobile app push notification that appears briefly on the screen and then disappears. Emails are rarely even opened and when they are, it may be long after the event or promotion you were advertising took place.
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. 
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