I heard about spire so I installed it on my iPhone 3GS iOS 5.0.1 untethered JBed with redsn0w. BigBoss's servers were slammed so I downloaded a deb and installed it with iFile. Spire shows up in settings prompting me to add a proxy server, look at more info or donate, but Siri does not show up in settings->general. Spire was also only 800kb, whereas they said it would be 100Mb+.