Actually no you dont have too.Because me myself I have a android phone and it doesn't really matter now if you want too you can just look at the market on your android phone and search it hope this helps bye.
You buy apps at itunes.
What doesn't an iPhone do would have a shorter answer.
To use apps you do not need internet, but you do need internet to buy apps.
Apple does not give you money to buy apps but many apps are free.
You can buy a variety of applications on the Google Apps Market. You can buy games for entertainment such as Angry Birds or you can even buy apps to help you with your everyday life such as a calorie counter.
Yes, they work to buy apps.
You buy the iPhone app
No, you just need to free download iTunes and then use it to buy apps. iTunes is free.
At the moment the only way to buy apps is with a credit card.
No, they will not charge you for apps if you don't opt in to buy them.
Yes you can buy apps they are from Android so they are pretty decent
MusicMovies (buy / rent)Apps (around 40% of them are free)Podcasts (audio and video)iPhone RingtonesAudiobooks