Josie,
You need to subscribe your test phone using the test phone number in
the mobile setting page.
Using the test phones
In the Settings Panel embedded in your site, subscribe an existing
test phone like this:
* Select Zeep Test Phone (+test) from the country dropdown
* Type the Number in the number field
* Click Confirm number and follow the instructions in the panel
http://zeepmobile.com/images/global/test-number.gif
Jason