I prefer Iphone over Samsung's phones personally. What about yourself?
IPhone ,is a line of smartphones designed and marketed by Apple 
I am aware of that. But what is your opinion of IPhones? Are they any good? I like their design, personally. Way better than what Samsung or any other Android phones have.
 The first-generation iPhone was released on June 29, 2007, and there have been multiple new hardware and ios
I didn't jump on the IPhone bandwagon until IPhone 4 myself, but I wouldn't consider switching back to Android now. I like it far too much for that.
Sure! Following a number of notable leaks, the iPhone 4 was first unveiled on June 7, 2010, at Apple's Worldwide Developers Conference in San Francisco, and was released on June 24, 2010, 
Yeah, I bought it shortly after it got released. How different was it compared to the IPhone 3 when it was released? Like, were there many changes made? Or just some?
The iphone App Store contained more than 2.2 million applications available for the iPhone.