Can someone tell the difference between Sprint TP2 and Verizon TP2?

[drurc8]

I have heard that Verizon TP2 SIM can be unlocked with 8 digit numbers provided by Verizon carrier and many Verizon TP2 users tried ATT or TMobile sim, and it works fine with voice call, right? Can you tell me whether Verizon TP2 uses 64K or 128K sim? Is Verizon TP2 sim card the same size as Sprint sim that comes with Sprint TP2? I heard that all US GSM carriers such as ATT and/or Tmobile use only 64K sim, am I correct? That's why Sprint TP2 is not compatible with US GSM sim. I thought Verizon TP2 is the same phone as Sprint TP2 so sim that comes with Verizon TP2 should be the same as Sprint TP2 sim, right? Sprint TP2 sim comes unlock ready and it won't work with US GSM sim, it only works outside the US and you need to pick up 128K sim at local store of your country destination. Therefore, I think Verizon TP2 is better than Sprint TP2 because Verizon customers claimed that their TP2 works with US GSM sim such as ATT and/or Tmobile.