Soldato
I thought the 3GS to iPhone 4 was huge. It was the first mainstream phone camera I found to be capable of taking some really impressive images and video (outdoors), and the screen was fantastic too.
FaceTime made video calling much more common, and the phone itself was very nice in the hand.
Still my favourite iPhone to date. Though since the 5s, none of the newer phones have been that much better, aside from size.
Looking forward to the announcement later though, it's always interesting, and slightly cringeworthy as well...
Our work cover phone has just become an old iphone 4s, I was asked to setup the mailbox on it, it was great to hold again, hadn't held one since I sold my 4 years ago, it still feels great in the hand, nice and weighty, it feels very premium, even now. The 4 was an excellent design, that's for sure!