I had to add;
My iPhone 4s is the runner-up to my BlackBerry 9780.
I bought this phone when it first came out, and I'm STILL using it, waiting for the iPhone 7 and will finally upgrade then. I have an NUU Battery Case on the 4s so it has enough juice for a full day, but it's so small and the dual core is so slow that 9.3 runs a bit too slow for me. I'm sure an iPhone 7 will blow my socks off with speed. I'm guessing the 7 will be at least quad core if not hex. But until then, I have to give Apple credit. I've been using this 4s off an on for 4 1/2 years. Just six months shy of the record I set with the 9780.