Cause Error 98, Class 3: What the heck does this mean?

[Ten30]

I have scoured the internet and no one seems to know, and I even called tech support. Some people say this might mean my number has been blocked, which is possible but I would not think likely.

I texted this person and got the error message immediately. I text another person afterwards to see if it was the same across the board but that person got my text just fine. As far as I know it is only this number.

[budone]

Can you call the number and do they answer? Does it go to VM?  If no to both, my guess you are blocked

Was reading it seems to be a Sprint error. Does this person use Sprint