Now iPhone released the latest software upgrade, 2.2. Should we upgrade? If you are using iPhone with AT&T plan, sure, go ahead and upgrade. If you are using a TurboSIM card to unlock your iPhone and use it with T-Mobile or other carriers, DO NOT UPGRADE!!
The 2.2 software does NOT work with your TurboSIM, and after you upgrade it, you WON'T BE ABLE TO DOWNGRADE to 2.1 anymore. Your iPhone 3G with 2.2 software can only work with AT&T at this moment!
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