Carrier Update for iPhone via iTunes

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Carrier Update appeared today via iTunes.

We can find several reasons for this update:

1. iPhone tethering options

2. Making iPhone compatible with ATT MicroCell (service/device to route cell calls using Internet)

If you update you may need to reactivate your iPhone, so if you have jailbroken phone – update it if caution.

You can learn more about Carrier UPdate from Apple’s knowledge base.