Iphones Have Many Capabilities, One Of Which Is Its Ability To Act As A Modem. There May Be Times When You Need An internet Connection In An Area Where There Is No Wi-fi. Using Your iphone As A Modem Allows You To Connect Your laptop To The Internet On The Go. Since Iphones Automatically Have A Data Plan Included When You Subscribe To At&t, You Just Need To Learn How To Enable The modem Function In Your Iphone.