T-mobile, to be sure, I didn't look at. But with that plan, "if you are in the top 3% of users" (which 60GB/month is likely to be, especially as that's just one of those four users), your data use will be slowed to 2G speeds.
"typical download speeds of 40Kbps-200Kbps and upload speeds of 20-80 Kbps"
Snapchat is going to get pretty painful pretty quickly.
But nobody uses 60GB of data on data only. When you're at home you're typically connected to Wifi. Also in many ways that's besides the point. Usage on mobile devices is skyrocketing and in particular young users are the reason for it. At this point high data usage per month is not exactly an exception but the norm.
