I've always been a gadget freak and two of the first 'smart' phones I had were the
02 XDA, which I still have to this day, and
Nokia 9000.
Prior to that, I had paired my HP IPAQ with my Sony Ericsson phone for all internet based functions, such as they were at the time.
I picked up the first iPhone in 2007 and it was a breath of fresh air for me. It totally revolutionised how I used and carried my phone. I've had the 3, the 3GS, the 4 and the 5 after that and have not looked back since. I've had an iPhone as my personal phone in my stable of phones since the very beginning, although i've always had a secondary phone for work to go with it. It's why I feel so naked having broken my iPhone 5 recently. I cant afford another one currently and my insurance company are insisting we go down the attempted repair route first (not a chance that will work).
I love just having an iPhone that I can rely on that 'just works' and I don't have to worry if the thing is going to crash on me or throw up some incompatibility errors like Android seem to do on occasion.