Ok i just bought an iphone 2 days ago, it already came with cydia with bb 5.14 and then i upgraded to 6.15.00 with redsn0w. I went to cydia and typed in the ultrasn0w. When i was about to install it, it says it only comes with 13.5 kb. It does not come with the mobile substrate. I think thats the reason my iphone can't find my t-mobile sim card! Where can i get the mobile substrate???????! I searched on cydia and couldn't find it!!