After you've sent your SMS campaign, you'll be able to see a statistics section on your campaign when you look back at it. 

Here you'll be able to see some basic data as to which recipients successfully received your SMS.

1. Basic statistics: Here are some basic statistics including how many recipients were added, how many successfully got them, and how many failed. 

2. Success statistics: How many SMS' were successfully delivered, and the success rate.

3. Recipients: Statistics relating to specific Recipients. Here you'll find if a specific Stakeholder had their SMS successfully delivered, or if it failed. 

Want to know how to find the Event that's created after sending your SMS? Take a look at this article.