Here's what you're gonna miss from iPhone:
1) Gamecenter
Xbox games is supposed to be our version of gamecenter, but lets just say it doesn't work out well. Nobody releases games for Xbox live because it is so inconvenient for them to go through the long process of branding a game as an Xbox game. So, our game center sucks because you can't even do multiplayer through it, all it really does is has or achievements and that's good if you care about gamerscore if you are using Xbox only.
2) Texting UI
iPhone has nice texting design but windows phone is pretty ugly. If you reply with a short text, it will send a huge rectangle message, and not send a bubble the shape of the text like iPhone does. Word flow(Swype) is nice, but it doesn't make up for the ugly rectangular texts that we have on windows phone. This bothers me because I am a teen and I text a lot, and have to see the ugly texts. It just has such a basic text UI and looks so ugly.
3) iMessage
I think have somewhat of an equivalent to this but it isn't as great since nobody seems to have a windows phone. iMessage was good on iOS because lots of ppl had it. This also means we dont have the seen underneath the text or delivered. If you want to be notified of delivered texts you must enable it under settings and it will tell you in a completely separate text thread(as a person named operator or something). Fortunately, nobody can see when you start typing. So, you are safe from being in trouble if you text back later.
4) Apps and Games
Of course, we almost never get any of the current new hit games unless the company has already supported windows phone such as gameloft and EA(WHERE'S MADDEN MOBILE AT?!). It's just a long complicated cycle, nobody wants to support windows phone because there are not enough user and people dont want to get windows phone because there aren't enough apps. Btw, if you use Kik, good luck that app is complete ****, it hasn't been updated in over 2 years.
5) Design/UI
Our tiles look nice, but we have a lot of basic ugly looking places. The settings looks so plain and ugly, and our notification center could use some work. Music app needs a little work, but at least my albums are finally back in order instead of alphabetical order. Message app looks plain as I said, and some people find the home screen confusing for some reason.
If you make the switch, I hope these features dont urk you too much because I doubt this stuff is getting fixed anytime soon.