The iPhone 4's quad band antenna supports 900 MHz UMTS/HSDPA, so it should theoretically work just fine with Vodafone's extended 3G network (the first iPhone to do so). But since getting my iPhone 4, I've noticed that in areas where Vodafone's coverage maps claim there's extended 3G coverage, I'm still connecting via GPRS. Anyone else seeing this? I posted something similar to this in Vodafone's forum last night, but they haven't commented yet.
I'm wondering if Vodafone has to issue a carrier file update in order for the iPhone 4 to connect to their extended 3G network, or if maybe there's something I can do on my end to get it working. Being able to say farewell to bloody GPRS was one of the things I was most looking forward to with the iPhone 4, so if anyone has any answers, I'd appreciate it.