Really, I do. I currently have a 64GB iPhone 5, bought a year ago, and there's less than 10GB free. As well as making calls or sending text messages via my phone network, I access my bank from it; quickly surf the internet to find out or confirm something; read my latest book via Kindle at lunchtime; chat to Our Man in the Middle East via WhatsApp; chat to my sister in Australia for free on Viber. It's my primary camera and stores most of my music. I've written blogs on it (although the Blogger App is a bit clumsy). I talk to friends and family on Facebook; visit Ravelry for knitting inspiration; download and listen to podcasts, as well as audio books while I drive. Every morning, you'll find me doing my daily French lesson on Duolingo (which is free). There are exercise programs I attempt follow (look out for the free 7-Minute Workout and RunKeeper). For calorie counting, I use My Fitness Pal. I use the BBC apps all the time, including iPlayer and iPlayer radio.
So much of what I use on the iPhone is free. As well as podcasts, most of the 100+ Kindle books I have were free via BookBub (or discounted to 99p). All the BBC content is free. As is Duolingo and the Learn French videos on youtube.
The only thing that detracts from my iPhone is the network. A year ago, when I upgraded to the iPhone 5, I switched to Vodafone and I'm not impressed. Can't get a consistent signal anywhere. Can't get a signal at all for large tranches of the day in my office - never had a problem with my old network - and even in the centre of London I've had problems. I am counting the days until I can break the contract.
Excuse me. I'm off to play with my Toy.