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  • Yes, the unlocked iPhone 4 features SIM card slot. Since the phone is unlocked is compatible with any GSM carrier such as T-Mobile or AT&T.
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Apple iPhone 4 (MD439LL/A) - 8GB Smartphone - Black - Verizon (Certified Refurbished)


Users can unlock the iPhone 4 through the cell phone carrier if the company allows it. If the carrier forbids unlocking or charges a penalty fee, then users may either pay the fee or jailbreak the phone by downloading a third-party app. A carrier unlock is safer than jailbreaking because it does not void the warranty or require users to download potentially harmful apps.

"Buying an unlocked iPhone 4 allows you to choose your own GSM carrier, change carriers at any time, and even use multiple carriers if you travel frequently," Apple points out on its unlocked-iPhone 4 page.


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How to unlock iPhone 4 can only be done using GSM iPhone devices. This means that iPhones that do not support the ability to insert a SIM card (CDMA iPhones), cannot be unlocked.