How much would an iphone cost per month?

So i really want an iphone but i have a plan with t-mobile is there any way of me even being able to get one with at&t or Verizon or something? The ideal plan would have unlimited txts &data &talk. How much would that be? But i don't really care about having unlimited talk and data but i need unlimited txts. So what's the cheapest plan with unlimited txt and a good amount of talk and data? I really have no idea how phone plans work so please try to make the answers easy to understand lmao.

At&t has a minimum data plan of $15 a month for an iPhone, its not a lot of data but if you have Wi-Fi at home it is not an issue, as far as calls and messaging goes, you can set how many minutes you want each month and texting shouldnt be too bad, it changes from state to state and store to store and time itself the prices are always changing. I have a plan with 3 phones all with unlimited texting and a generous amount of minutes and its around $140 a month

$100 a month on verizon gives you unlimited minutes and txt and 2 GB of data

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