How to get iCloud for my iPhone 3g?

I'm having a iPhone 3g with iOS 4.2.1 and i don't have an mobileme account how can i get iCloud for my iPhone?
if i use whitedoor to upgrade to ios 5 will it degrade my device?

I guess iCloud is disabled in whited00r version?

Get an iphone upgrade man, seriously!

Look on youtube

You need an iPhone 3GS or higher to have iCloud. The software also must be iOS 5 because iCloud doesn't come on iOS 5 <.

I wouldn't use white door simply because it will not be a stable version of iOS 5.