Approximately how much does it cost to own an updated iphone with unlimited text and data per month?

I'm considering switching to verizon to get an iphone.

I have also had an iphone before with Verizon but someone else was paying for it on my behalf. This time I'm looking to owning one independently and would love to know how much unlimted or limited text and data would cost per month and if I buy the iphone could I pay it off little by little or would I have to pay it all at once.

If you actually think financing a phone is a good idea then you are an idiot, people finance $150,000 houses not $300 phones. If you sign a 2 year contract with a 12 month guarantee then you could pay anywhere from $30-$200 and you wil have to since you signed a contract. Or you could get contract free Virgin Mobile with unlimited everything at $35 a month and no phone financing.