UK carrier O2 has announced its special Pay & Go pricing for the iPhone 3G, a match to contract plans which have been available since July. The Pay & Go options will only become available on September 16th, and will cost £350 for an 8GB phone, or £400 for a 16GB model. Each choice will get users a free year of web browsing and Wi-Fi hotspot access, after which point data will cost £10 per month.