Hey all, Just thought I'd tell you about my iphone upgrade adventure this week and wondered if anyone else has had similar issues. I bought an iphone 3G from an O2 store in London on Wednesday. I upgraded from a non 3G O2 phone so I was given a new sim card. For various reasons I didn't have time to set it up so it's been sat in its box for 5 days. I finally got round to setting it up last night. I put my new sim in the iphone and connected to itunes. Almost immediately a message flashes up saying 'Activation cannot be completed as a network cannot be found' Since then nothing has changed. Everytime the iphone is turned on it tries to activate but nothing happens. I've called o2 this morning and to my surprise they have no record of my upgrade, the iphone itself or the sim card. I'm still on my old tariff and as far as they are concerned I only have my old phone. I have to call again later to see if they've sorted it out. Anyone else had a similar problem?