Sprint pricing is actually really good if you have 5 lines. I pay about $45 per line for unlimited everything (plus the ~$400 phone subsidy every 2 years for each line). Sprint does have the slowest data speeds by a large margin from what I've seen though, so it's a trade off.
That is changing though, if it hasn't already. I'm on a family plan where there first phone is like $100, then each additional 4G phone is $29 per month, unlimited data on all. So once you get to 4-5 phones, that's a hell of a deal. I currently pay like $205 a month for 4 phones(that is including all fees and taxes). However, I went to a Sprint store last month to try and add on my step sister, and the plans like we have where you can choose your various amounts of minutes with unlimited data are disappearing. Sprint is going to only offer unlimited everything, and it's going to be about $60 per line, no matter how many you have on a family plan.
Glad to see that competition is finally forcing these big carriers to be price competitive.
The problem is that AT&T has god awful rates on their lower data tiers. If those rates were $10-$20 lower a month than they'd crush T-Mobile. As it stands, they changed their rate structure but barely touched their prices (which the people on T-Mobile care about most).
Depending on how many minutes you use a month, you could always try the $30 TMOUS plan. I've heard of people really digging it if they don't use a lot of minutes every month.
They give you two years to pay off your phone with monthly installments. Once the phone is paid for it's yours. It's very clear on the bill how much you are paying for service and how much you are paying for the phone. It's basically a two year interest free loan for a phone.
