There are 3 major operating systems for cell phones ( iphone, android,  and windows). There are others however not as popular.

My HTC one x (android) phone completely died a month ago. I have only had it 6 months, not happy.   I decided to go with a cheaper phone temporarily, it is a Nokia windows phone only cost me around $ 72.00, I have the micro sim card  through my HTC phone, so I needed to match it by simply switching it out to a new phone that had the same size Sim card slot. I took the sim out from my HTC phone and swapped it into the Nokia.  I am impressed with the quality of  the Nokia’s features.