If your open rate is low, your goal will be to start improving that. If there are multiple parts of your message that you would like to improve, start with identifying the most important one. If, for example, your open rate and click-through-rate of the message’s contents are low, it would be better to first work on the open rate. After all, no one is going to see your improved content if no one is opening it in the first place. So, determine your goal and let that direct your focus towards the thing that needs improvement most.  
There is a 160 character limit on text messages. With SMS, it’s simply about providing an irresistible offer. There’s no point in droning on and on with a 300-word marketing message. Subscribers are opting in to receive an exclusive offer, not to hear about how your day is going. Our current digital age rewards simple marketing messages with easy to understand calls to action. The 160 character limit on SMS messages is actually ideal.

We’re firm believers that the follow-up is one of the most important elements of the selling process. After you fire off an email looking for an approval or confirmation, a short follow-up by text could be the perfect nudge to get your prospect to take a look. Remember, since 90 percent of text messages are read within a few minutes, there’s a good chance your SMS follow-up will be seen right away and prompt your prospect to answer.
Sending text messages to phone numbers of owners who have not opted-in to your SMS campaign is an illegal practice. It is a violation of federal law under the TCPA, and it can result in costly lawsuits. Consumers can sue you for sending them unsolicited messages, and they can claim between $500 and $1,500 for every unwanted text message that you have send to them.
Collecting phone numbers at your brick and mortar place of business is as simple as filling out forms or collecting business cards, but what about online? Again, that can be as simple as asking customers to email or text you their information, or you can go high-tech and actually set up an online form, linked from your website, Facebook page, or even advertising links.
In order to gain their mobile number, they will have to have a great deal of trust in you and a pre-existing relationship will help. They also need to know that what you'll be sending them via SMS message is exclusive offers, not the same offer that you give via email and social media. Be clear with your customers and use the following guidelines when introducing SMS marketing to your customers:
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