Default T Mobile HTC Flyer on Straight Talk
It turns out the T-Mobile HTC Flyer is blocked by imei so you can only use Phone/Txt or Data only if you use it on T-Mobile.

I activated a T-mobile sim on Straight Talk for $45 unlimited everything and the T-Mobile branded Htc Flyer works perfect. My data rates have been around 5000+kbps down, 2400+kbps up and strange pings of either 85ish or 600ish.

If anyone takes their 3g international or T-Mobile 4g to Straight Talk be sure to order the Sim card for T-Mobile not AT&T. I understand if you use the AT&T sim you will only get 2g/edge.