Roaming - this is somewhat grey but if you go look at Straight Talk and you use a the BYOP Sim plan, your phone 'roams' on the combined networks of ATT and Tmobile and some smaller companies for voice/text. I don't really call it roaming since the MVNO pays to use all those networks and it's not how you roam say when you're with Sprint and go off their native network onto VZW. It's 'all' their 'native' network since they are an MVNO.
Family plans are starting to show up in prepaid. I used to use a company called iWireless through the Kroger food stores. Yes, it runs off of Sprint, but they have family plans and they even have 'shared' data if you will, many months before VZW did it. I think ting was already pointed out. No, not every time is every single specific need going to be met by any one plan. This is why we have choices and I didn't say the big networks needed to go away, I said they needed to be relegated to the same status as all other utility companies in this country.
I then pointed out that even having to pay a couple to a few hundred dollars upfront, these companies are far from losing any money when 'subsidizing' the iPhone or other phones. I'm all for keeping the postpaid accounts and family plans - but do away with selling phones and borderline illegal contracts.