Apple now offering unlocked iPhone 4 in U.S.

As previously reported, Apple has started selling unlocked GSM iPhone 4 units through its stores in the U.S. and online.

Apple is pricing the handsets at $649 for 16GB units and $749 for 32GB models; black iPhone 4s are given a shipping estimate of 1-3 business days, while white units are listed at 3-5 business days. In its description for the handset, Apple says, “If you don’t want a multiyear service contract or if you prefer to use a local carrier when traveling abroad, the unlocked iPhone 4 is the best choice.

It arrives without a micro-SIM card, so you’ll need an active micro-SIM card from any supported GSM carrier worldwide.”