I don't have one yet, but I got one for my dd once I found out that she could do GPS by means of voice while driving. She used to get lost a lot, so this is a safety feature for her, especially when driving at night. It will even pronounce the street names.
I am going to get an iPhone for myself soon because there's an app that allows you to live chat internationally at no cost (Whatsapp). (Whatsapp is also available for android phones and several others, but not my current "semi-smart" phone.)
My dd needed help getting set up on the phone, so I had a chance to use some of the features. I liked that it was very user-friendly. The choice for us was between an iPhone and a Samsung Galaxy android phone. I just figured with our tech-deficient family the iPhone was worth the extra expense because of its ease of use.