i would like to start my data plan, but which one should i choose? i would like to use my data plan now, but will they charge me for my next bill? which one do you guys suggest? "Backdate to the first day of my current bill cycle: 06/20/2010 Choose this option if you want your new plan to begin immediately. Future date to the next bill: 07/20/2010 Choose this option if you want your new plan to begin on a future date."