I called T-Mobile Customer Service and said "my friend" gave me a code, could they try it for me? Here is the code "TZUNL599" The rep put it in and said "wow, I can't believe that works, awesome!" He verified that we had unlimited T-Zones and it was only 5.99. I just wanted to pass that along to anyone that needed it.

You might have to call more than once, maybe even 3-5 times before they give you this plan. They might even try telling you that there is no such code. Be persistent and keep calling back to talk to a different rep if you have to.

This worked for me, and a buddy of mine. Plus "internet2.voicestream.com" is currently working with this plan.

Hope this helps!