you can upgrade to 1.1.3 nd still be able to anysim/jailbreak ur iphone
just get the ziphone for wndows xp the one on mac when u unlock it for some reason disables sound. but if u get ziphone from my website i have a working version that i tested on my 1.1.3 iphone and ipod touch
http://w.ecksean.com:8080/ZiPhoneGUI.rar
good luck