The info you found indicating it is an ancient service and no longer offered is correct. Without seeing what you are, it is difficult to offered more advice.
@Misty The spark sampler is our first version of data plans, it was a feature that enabled text messaging and web browsing at the time. It is possible the 999-999-9999 you're seeing for text messages is because the feature is no longer compatible since we no longer provide text message details. I hope this helps.