"Apple on Tuesday started selling an unlocked version of its iPhone 4, starting at $649. A 16GB unlocked iPhone 4 will set you back $649, while a 32GB version is selling for $749. Both are available in black or white; the black will ship within one to three business days, while the white is available in three to five days, according to the Apple Web site. The benefit of an unlocked phone is that you are not locked into a two-year contract with a particular provider. But it also means that you don't get the subsidized pricing provided by someone like AT&T or Verizon. The same phones with a contract cost $199 and $299.