I recently loaded a Official OS to my old Curve (not used anymore). This was just me experimenting, all went well. And it all works until I place my Sim in the Device, then the Trackball freezes. The Sim is ok I'm using it now on my 9780,the OS is OS5. I did think to load an older OS, or is it a carrier issue (blocked). Funny because Vodafone did offer to buy my 8900 back when I got my Bold. Any ideas?