Short codes offer very similar features to a dedicated virtual number, but are short mobile numbers that are usually 5-6 digits. Their length and availability depend on each country. These are usually more expensive and are commonly used by enterprises and governmental organisations. For mass messaging, short codes are preferred over a dedicated virtual number because of their higher throughput, and are great for time-sensitive campaigns and emergencies.[11]
Traditionally, agencies have relied on old-fashioned channels for advertising, resulting in a madhouse of billboards, emails, television and radio ads, all competing in unison to be heard or seen by your clients’ target audience groups. But email open rates have plummeted to a lackluster 22%; radio and television ads are expensive for clients and unreliable as a method of engagement; direct mail gets lost and has an open rate of only 2-5%. It’s time to update your clients’ marketing methods -- and luckily, that means simplifying the way they think about and approach prospect outreach.
Businesses have been collecting customer information for years by offering a birthday freebie, i.e. a free product or service on your birthday. Customers are more likely to trust you with their phone number if they get some sort of reward in return. You can also send them one-month, six-month, or one-year “anniversary” bonuses based on their sign-up date.
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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