I am in need of purchasing a cell phone. I am in need also of a PDA-type device to keep track of an increasingly busy schedule. Consequently, I have considered purchasing an iPhone 4 and killing two birds with one stone. I do not need a lot of minutes at the moment, but I foresee that changing in the near future. I would consider a pay-as-you-go phone for now until the iPhone 5 comes out, but after looking at AT&Ts data rates, and assuming Verizon follows suit in the near future (i.e., some time in the summer), I am weighing whether to purchase an iPhone now to lock in the unlimited data plan or whether to wait for the iPhone 5 and accept a more limited data plan. So here is my question: For what do you use your data on your iPhone and how much do you use? monthly average? low and high amount?