Both O2 and Vodafone have announced plans to sell the iPhone 4 in Germany. The announcements signal the end of exclusivity for Deutsche Telekom’s T-Mobile unit, which has been the lone German iPhone carrier since its launch in the country in 2007. According to the Wall Street Journal, O2 and Vodafone will begin sales of the iPhone within the next two weeks, widening the retail-distribution base for the handset ahead of the holiday shopping season.…