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Before you begin using your new iPhone, you need to activate a wireless service plan from a wireless service provider that supports the iPhone in your home country. Unless you’ve purchased an unlocked and contract-free version of the iPhone, this typically requires you to sign a two-year service agreement.
Tip
If you’re upgrading to a new iPhone model, you have the option to keep your old service plan or modify the plan, based on your needs. However, if you’re simply upgrading your existing iPhone to iOS 5, no changes need to be made to your wireless service account.