I am an iPhone n00b, I bought an unlocked iPhone 3G 4.1 running Cydia. It has met my basic needs to use an iPhone on T-mobile. But I want to change the background from boring black... is this possible?? And what about multitasking? is that a feature only avaliable to iPhone 4? and I found something that made it possible to send MMS but what about receiving them?? any help would be appreciated!