So, I switched to Straight Talk earlier this week, and so far, I am in LOVE.
With Straight Talk Sim, I cut my cell bill down by another $15 a month and actually get all of the features I was promised with my more expensive carrier.
For $45 a month, I am able to get UNLIMITED talk, text, and 3g data. And Straight Talk runs off of AT&T and T-Mobile towers, so you pretty much always get signal. Oh, and I'm able to use the sim card in my iPhone.
LOVE LOVE LOVE LOVE LOVE!