The iPhone 4 is equipped with GPS, Wi-Fi and a digital compass. It features two cameras and a sensor that detects angular acceleration around three axes. More »

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New iPhone 4s are available for purchase on Amazon and Best Buy. Both retailers offer a variety of models with different service provider compatibilities. Users can also buy an unlocked iPhone 4 to work on any compatible... More »

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The major considerations when pricing an iPhone 4 are the condition of the phone and the memory size. The phone's network affiliation can also affect its price. More »

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Buy a used iPhone 4 through eBay.com, Craigslist.org, Gazelle.com and Swappa.com. EBay, Craigslist and Swappa.com are online marketplaces through which iPhone 4 owners can list their phones for sale. Gazelle buys used ph... More »

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A person can track a missing iPhone 4 through iCloud and the "Where's My iPhone" app. It is important to remember that iOS 7 must be installed on the phone and the iPhone activation lock must be turned on through the app... More »

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An iPhone 4 can be unlocked to work on another carrier. The current wireless carrier will need to provide the unlocking service. More »

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The iPhone 4 model, which is manufactured by Apple, Inc., can be jailbroken by using paid-for software, such as iJailbreak Pro. Jailbreaking pertains to the method of removing hardware and firmware restrictions on the iO... More »

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