Excellent question! i was wondering the same thing before i made the jump, so I created a spreadsheet that would calculate the total cost over time for various plans/phones that the different carriers offer. That way I could see where the break-even point is and the total savings. I plugged in the current prices from AT&T's and Cricket's websites for the Galaxy S6, and this is the result:
| AT&T | Cricket |
Phone price (w/tax) | $357.99 | $688.99 |
Monthly plan (w/tax) | $148.40 | $35.00 |
Total 1st year cost | $2,138.79 | $1,108.99 |
Total 2nd year cost | $3,919.59 | $1,528.99 |
By the 3rd month you'd break even with Cricket, then save $1,030 in the 1st year, and $2,391 by the end of the 2nd year, compared to a 2-year contact with AT&T. The Samsung Galaxy S6 is a new premium phone, so even AT&T is charging $300 for it on a 2-year contract. Plan choices are a bit more complicated on the AT&T side with their Next12, Next18, & Next24 plans, but keep in mind those low payments last longer than their corresponding "Next" plan, and either way will still cost more than you'd pay with Cricket.