Log into your account ten minutes after your campaign should have launched. From the toolbar, click on "stats and reporting". For a campaign that is currently running, click on RVM statistics. The next screen will show you the status of the campaign. If the campaign has stopped because you have run out of eligible time zones, there are no more leads in your list, or for other reasons, that information will also be here.
You will have a greater chance of gaining access to their mobile number by following these guidelines. You can collect their numbers using a sign-up sheet at your register, asking them when talking on the phone, allowing them to submit a form on your website, or by giving them a number that they can text to subscribe to your SMS messages. Whatever you do, keep a copy of their permission to market to them via SMS, if you run into problems you will be glad you did.