I have 5 people on a family plan. Is that ruinously expensive? No, because it is our beloved, low-cost TMo. I am on 2 Gb, everybody else is 200 Mb (grandfathered with no overages), for a grand total of $60 in data charges. That gives me 5 upgrades every 22 months, or an upgrade every 4.5 months. I take the latest and greatest, and the family gets my hand-me-downs.