How much does it cost a month to have a smartphone/iphone?

I have sprint btw
On our plan are 3 people and we all have basic phones.
Basically, these phones suck and you like can't even buy anymore basic phones. They are all smartphones and iphones now.
How much do you think it would cost just for ONE smartphone and 2 basic phones on a monthly bill?
And how much would it be for 3 people to have smartphones?

How much is your bill for a smartphone or iphone?

30 to 50 dollors

I'm with tmobile,
Single about 50-70 bucks
3 people about 160-200 bucks.

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