Good reasons why teens need iPhones?

Okay my daughter is turning 13 in October and has been begging me for an iPhone forever. She has a phone which she can only text and talk for 2 years or so. She also has an iPod Touch which she can't use outside the house without Wi-Fi. She is very responsible and receives good grades. What are some good reasons of why I should get her an iPhone for her 13th birthday?

I'm 13 like your daughter so I won't be much help but iphones are like a kids dream until the new iphone comes out next July. And if you wanna b frugal about it buy it from verizon i hear they have a plan for 30$ a month for an iphone. And it'll probably break her heart if you don't get her one seeing others kids with something you don't have and you no you can afford it its not fun hope i somewhat helped

At 13 I don't think they need one as they can use the ipod or ipad to text friends free with imessage etc, no monthly plan needed and you can monitor them that way. When they get in hihg school they may need a way to text or call you for rides, etc, so that would be a good reason.