There isn't one.... Just a quick moan about the UK's carriers. I'm currently with o2 on an iPhone 4 and have been with them since about 2001 when they were BT Cellnet. I'm thinking of changing to 3 because where I live and work I rarely see an indoor 3G signal and can only imagine how this will affect Siri on a 4S. I have a 3 Mifi and seem to get a fairly decent 3G signal where ever I need the internet. I was however disappointed to find out recently, that o2 is the only UK network that has visually voicemail. So every network is a compromise, I either get the full iPhone experience with o2, without the internet or a cutdown iPhone experience with the internet. What's worse for me with o2 (and anyone else using o2 that's involved with Scottish schools) is that o2 does't work with Glow (a national school's network) either on the iPhone or on a laptop using tethering. Also o2 compress jpegs (probably because they know how good their network is, so graphics don't look so good on an iPhone. So after nearly 4 years of the iPhone in the UK there is a pretty poor choice of network. I'll probably end up with 3 if I get a 4S, since the internet is mostly what the iPhone is all about. PS I remember reading when the first iPhone came out that EDGE was just a software upgrade for cell towers. Is that the case? If so why hasn't o2 done this? I mostly see GPRS, sometimes a 3G and rarely an EDGE signal.