Whatever you do, don't switch to Samsung or Android. Worst 2 years of my mobile phone owning life has finally ended. Bought myself out of the last 5 months of my contract I hated the phone and operating system that much. Back to an iPhone with the 6 plus now, done wonders for my stress levels actually having a phone that works.
I'm sorry that not part of the script. It's a well known fact that everyone who moves to having an Android wishes they'd done it years before, feel an idiot and a sheep for ever considering the iPhone and extol the virtues of Androids at any vaguely phone related conversation.
They never ever go back to the iPhone.