Concatenated messages can only fit 153 characters instead of 160. For example, a 177 character message is sent as 2 messages. The first is sent with 153 characters and the second with 24 characters.[14] The process of SMS concatenation can happen up to 4 times for most bulk SMS providers, which allows senders a maximum 612 character message per campaign.
This is why they designed their own customized queue logic and set up intelligent call routing flows. With the new routing logic Apartment List was able to classify the caller need and assign them to the right agent. Minimizing wait times and maximizing efficiency, the online directory has drastically increased call volume and improved customer satisfaction.
Try running a contest exclusively for mobile customers, where by signing up for text messages they can be entered to win a free product or service. Or by signing up for your “inner circle” they can be eligible to participate in regular contests, such as trivia games, voting for their favorite product or service, or any other kind of contest or competition you can come up with. Holding regular fun contests is a great way to keep your customers engaged.
Mobile advertising has become more and more popular. However, some mobile advertising is sent without a required permission from the consumer causing privacy violations. It should be understood that irrespective of how well advertising messages are designed and how many additional possibilities they provide, if consumers do not have confidence that their privacy will be protected, this will hinder their widespread deployment.[40] But if the messages originate from a source where the user is enrolled in a relationship/loyalty program, privacy is not considered violated and even interruptions can generate goodwill.[41]
Don’t forget to include your SMS marketing campaign as part of your overall marketing plan. Place a call to action on all of your marketing products, print and digital, inviting customers to join your SMS circle by texting a message or code to your phone number (in exchange for a discount, freebie, or other reward). This will help to broaden your customer base as well as increasing sales.

As the name implies, shared virtual numbers are shared by many different senders. They’re usually free, but they can’t receive SMS replies, and the number changes from time to time without notice or consent. Senders may have different shared virtual numbers on different days, which may make it confusing or untrustworthy for recipients depending on the context. For example, shared virtual numbers may be suitable for 2 factor authentication text messages, as recipients are often expecting these text messages, which are often triggered by actions that the recipients make. But for text messages that the recipient isn’t expecting, like a sales promotion, a dedicated virtual number may be preferred.
Sample size indicates the size of the group of people who are going to receive your message. The size of this group and the amount of conversions you’re getting determines the significance of your test. Significance refers to whether we can rely on the made changes to have generated these results, or whether we can’t rely on the changes, but see that the results were simply due to chance. What this really means is that we want to be able to say: we can be 95% sure that the changes we made will improve our conversion rate. 
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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