1. Get Permission
You must have permission from people before sending them text messages. If you don’t have their explicit consent, not only will you be breaking laws and possibly be subject to legal penalties, it will also cause you to look spammy, create a bad name for your organization, and annoy your audience.
So what is permission? How do you get it? If your subscribers are opting in by texting to join, then you already have it. If you are manually uploading a list or adding your contacts one by one, you’ll need written consent. This may be the most important best practice for any SMS marketing program.