I successfully jailbroke my iphone 4, but cannot use facetime or MMS, since the first release of jailbreakme.com had these bugs.Since, I ve added IphoneDelivery through Cydia, but still no MMS.As I see it, my only choice is to re-jailbreak after a restore using ios 4.0.My question is will a reset accomplish the same goal, but leaving the IOS 4.0 intact?