DIY white iPhone 4 guide posted
Build your own
Want a white iPhone 4 but can't face the wait  until the end of July? Then make your own.
The secret: buy a white face plate from some Chinese guys on eBay, take your black iPhone 4  to bits, and replace black plates with the white ones.
'Don't matter if it's black or white...' except to Engadget
That's what Engadget did, and spells out the process here .