O2, the exclusive iPhone carrier in UK, is being told by Apple to prepare for a major announcement on 9th June. The date coincides with the beginning of WWDC 2008, where Apple’s Steve Jobs will give keynote presentation on the same date. It is believed that he will announce the 3G iPhone at the conference. In another 3G iPhone related news, CrunchGear has received a tip that AT&T is beginning to train its retail staff in preparation for the next generation iPhone. In a previous report it was suggested that Apple might start selling the 3G iPhones soon after the announcement. Well all signs are pointing towards a 3G-iPhone launch on Monday, the only question left is, when will we be able to grab one?