how to compare cell phone services ?

The best thing you can do is go to each cell phone company's website and compare rates. Going to just one website that may offer all that information a lot of times is not accurate for many of those websites don’t update often. Or else you can use Whistle Out to compare all of these things at once - minutes, included value and texts messages offered by providers in a single interface. They have many search filter options such as data, text and anytime usage habits like you have requested. Good luck and my regards.