I took a little time to make the evaluation of this smartphone, I wanted to have a little toured the unit before I comment. First, I have an iPhone 4S, which I was satisfied, but that could only access the 4G network. So I decided to change to another device for this purpose. The Nokia Lumia 830 enables such access to a substantially identical price 4S. My first test was carried out on the part of Nokia camera. At the outset I measured a quality gap with the iPhone in favor of Nokia: greater precision, color rendering, high optical sensitivity, in short, a must! I still had to test the Windows 8.1 environment. There, I admit I was worried, coming from a iOS, I feared not to find my way immediately. Again, pleasant surprise, this software is a beautifully simple and quite intuitive. I got used to it pretty quickly. Moreover, once the nano-SIM installed, I proceeded to test battery: again, a beautiful range of more than 60 hours without recharging and occasionally but regularly using the phone. So what's missing? The Windows Store is still the poor relation compared to the Apple App store, however, we find the essential and there is a safe bet that the offer will expand rapidly. It lacks a case the phone but a little bit expensive silicone shell will do nicely! In conclusion, this is clearly the return of Nokia, and it's always a good thing that the competition is strong. Apple will have to put his work on the loom, without fail.