I think it depends. I do see a lot of people choose both because an IPhone and an IPad are two separate usage in their everyday. For an IPhone, people can call, text, check e-mails, surf on the internet, play games, and so on. On the other hand, for IPad, people can do more than just a phone, which they can watch movies, web chat, web browsing, and etc. I think an IPad has a bigger screen than an IPhone, which people can use an IPad as a computer.