iPhone 5 in the USA

was recently researching this:
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The Verizon iPhone 5 is a model 1429 for the USA market that is configured to allow the use of any GSM Nano-SIM due to a FCC requirement with Verizon's purchase of a specific spectrum.
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This means that a Verizon model A1429 purchased from BestBuy will support LTE bands: 1, 3, 5, 13 and 25 in the USA or anywhere these 5 bands are supported.
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In other countries your model A1429 USA Verizon purchaed iPhone 5 will support LTE bands: 1, 3, 5. You will need to verify with the carrier any restrictions they may have on LTE support.
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So in the USA, if you purchase a model 1429 iPhone 5 make sure that you understand how it was initially purchased! There is no magic hardware, the control of the Nano-SIM slot is controlled by how the device is registered at point of sale or device replacement in the Apple servers.
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If it is ever registered as a Sprint iPhone 5 then the Nano-SIM slot will be locked in the USA and no other GSM carrier or MVNO will work. Sprint will only unlock the Nano-SIM slot for International GSM carriers if you meet the Sprint usage requirements.
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Currently in the USA, the new unlocked iPhone 5 that was just announced by Apple for sale in the USA is the model A1428 and not the model 1429! The model A1428 only supports the following LTE bands: 4 and 17. Note the FCC specs indicate that it also supports LTE bands: 2 and 5.
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Note: The unlocked iPhone 5 in the USA is model A1428. For details on LTE support see www.apple.com/iphone/LTE. If you want to use LTE bands in any country make sure that model you purchase supports the LTE bands available or planned to be available in the future.
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The unlocked USA iPhone 5 model 1428 will not work with CDMA carriers such as Verizon Wireless or Sprint. Learn more about the unlocked iPhone 5 in the USA.
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source: http://store.apple.com/us/browse/hom...family/iphone5
Open the "Or get iPhone unlocked and contract-free" section.
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Dave
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scroll down to see the full post:
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http://forums.macrumors.com/showthread.php?t=1452635&page=12

If the iPhone 5 is an unlocked one you will be able to use it with any networks.If it is locked to a particular network you need to remove the network lock so that you can use it with any GSM sim internationally.I unlocked my iPhone 5 using the remote unlocking service from http://www.superunlockcodes.com/apple-iphone-5/rs16wp9/ ,I used the remote unlocking service because it was simple and jailbreaking the mobile was not necessary.