Unlocked iPhone 4 Available on the Apple Website

Yesterday, Apple began selling unlocked iPhone 4s on their online store.  Is this leading the way for iPhones to be available on all US carriers?

Unlocked iPhones have been available since last year in Canada, France and the UK but starting yesterday you can buy them in the US.  You can buy a white or black 16GB or 32GB iPhone 4 for $649 and $749 respectively.

According to the Apple website, “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.”

But what this means, the only other carrier you can use in the US in T-Mobile or AT&T without the two-year contract.  There are other choices worldwide but how inclined are people going to be to pay either $649 or $749 for an unlocked iPhone they can really only use abroad?

Another thing we don’t know is how long these unlocked iPhones will be on sale.  Are they making way for an iPhone 5 or 4S or whatever it’s going to be called?  Does this mean that the new iPhone will be unlocked to where you can use it on different carriers?