How much does a iPhone 6 plus cost with a contract?

I'm debating whether to get a iPhone 6 or 6 plus.

Well you have to be more specific. There are many phone companies that offer many different prices for an iPhone 6 plus. With ATT's next plan it makes it more hard to gauge an exact price because it goes up when you add more GB and data. When I got my iPhone 6 plus with the next plan I had to cancel my pervious iPhone which cost about 200. But to answer your question I got mine for 50 dollars add onto my bill monthly.

I was debating the same thing, the huge screen would be easier to read but I'm not sure I want that size vs carrying in my pocket.

With Sprint, it will cost 299 for everything unlimited + partial cost of the iPhone 6 plus, every month.

With AT&T / Verizon there's no ' Unlimited ' nothing.

T-Mobile / Verizon also have data Caps.

Depends where you get it from, how long the contract is and how many GBs you get.

A 2-yr contract with just 16gb from Verizon is $299.

The best thing for you to do is just go to the sites for Verizon, Sprint, AT&T, T-Mobile and look because they will show you all the options. It doesn't make sense to ask here.

Edit: I have the Plus, and I love it. I have seen nearly everyone who has it complain that it's too big, but they are people who are probably coming from the smaller iPhones. I have been using a SG4, which is bigger than all other iPhones except the 6 series, so I'm used to a bigger phone and prefer the bigger screen. So, keep that in mind. If you have always had iPhones, you're probably going to not like the Plus.

$299, 399, 499.