Just put GB on my GT. Got directions off a site that told me how and used ODIN to do it. Was meant for GSM. I have the T-MO one. I installed it and OMG!!!! WI-FI hotspot!!!! Phone icon to make and receive calls!!!! So I can use this thing as a phone and tab!!! I am getting ready to return my BB Playbook!!!!! I put the sim card from my TMO BB Bold into the tab and VOILA!!! I can make and receive calls! Only thing is that no 3g icon..only EDGE. What to do...stick with this version for GSM or when the update gets rolled out for TMO, upgrade to that and loose phone icon...hmmmmm....