Japanese iPhone carrier SoftBank has revealed pricing details for the handset. In a statement the company revealed that it will offer the 8GB iPhone 3G for 23,040 yen (around $215), while the 16GB model will be sold for 34,560 yen (around $322), subsidized. According to a Bloomberg report, the company also plans to let customers pay for the handset over the course of two years, requiring them to sign up for a 5,985 yen (around $55) monthly data plan…