Best 2 people iphone 4 plan?

I'm just comning out of a contract with *** at&t finally, lol. I was opening up to changing carrier if neccesary, and iv looked and asked around all the carriers most of them end up confusing me or hiding hidden fees, i wanted to know what's the CHEAPEST carrier, wether it be at&t, sprint, verizon,. For a two people family plan. I don't mind the few minutes but i mind the text messaging and the data. I need those last two. Please and thank you i don't wana spend more than 150 a month, and if possible avoid another 2 year commiment

Simple mobile unlimited everything plan $40 each