content: I have the unlimited 4G, use my phone constantly all day, only connect to wifi if I don't have 4G service, and do everything I want including occasional tethering. I rarely exceed 5GB per month. I could probably go down to a lower plan but it wouldn't save me much money. If people are going over 21GB, they are doing some crazy shit with their phones.  Also worth noting that even with the 21GB cap, I pay $20 per month for 21GB on each of my lines ($40 total) Verizon and AT&T both charge $300 per month for slightly less data than that.