Ellie has a friend who wants an iPhone with unlimited data. Leo says Sprint and T-Mobile are the two carriers that offer unlimited data. They're very affordable as well. In fact, T-Mobile has a pay as you go deal for $30 that includes unlimited data and texting, and 100 minutes of calling. That's a bargain. If she doesn't mind a Google Nexus phone, then Google Fi is a great pay as you go plan.