Rogers Wireless and Fido have announced a new 6GB data option that will be offered to iPhone 3G customers who activate their phones by August 31, and have also revealed details of their iPhone 3G launch plans. Both will be opening select stores at 8 a.m. local time Friday morning to begin sales of the iPhone 3G, and will celebrate the occasion with free early bird breakfasts and various giveaways. Participating Rogers stores include the 112-10 Dundas…