There are two numbers that your Clearstream subscribers will receive your messages from: your Shortcode (ie - 970-00) or your Longcode (ie - 917-818-4557). Read the differences between Shortcodes and Longcodes. Nearly all of your Subscribers will receive messages from your Shortcode. Why? Shortcodes are meant for mass texting. Longcodes aren't.
When syncing a List from Planning Center or importing an Excel file, a small number of your subscribers may (often mistakenly) have Shortcode texting blocked with their wireless carrier. These numbers won't receive messages from you, and will be marked as "Failed" after you send a message. If you have any failed numbers after sending a message, the best option is to create a Longcode as a 'fallback' option for these numbers.
In this case, if you have a Longcode created in your account, those subscribers will receive messages from your Longcode. Everyone else will receive messages from your Shortcode. As long as you have a Longcode created, we handle this automatically to ensure the highest delivery rate possible.
While most texting providers offer either Shortcode or Longcode messaging, we offer both. Offering more reliable message delivery is just one reason for doing so.