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@thnkpads_user iPhones have SIM cards?
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And no, there is not contract on the phone.
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And no, there is not contract on the phone.

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Yes. My iPhone has a SIM card and it can be replaced. You need to check this with Verizon and AT&amp;T. <br />
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... Thinkpads_User
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Yes. My iPhone has a SIM card and it can be replaced. You need to check this with Verizon and AT&T.

... Thinkpads_User

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I have an old iPhone 4 that I used while on Verizon Wireless. Can I activate the phone on AT&amp;T and utilize it? If so, how? Jailbreak it?
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I have an old iPhone 4 that I used while on Verizon Wireless. Can I activate the phone on AT&T and utilize it? If so, how? Jailbreak it?

Verizon Wireless iPhone 4. Activate on AT&amp;T?

A smartphone or smart phone is a mobile phone with an advanced mobile operating system that combines features of a personal computer operating system with other features useful for mobile or handheld use. They typically combine the features of a cell phone with those of other popular mobile devices, such as personal digital assistant (PDA), media player and GPS navigation unit. Most smartphones can access the Internet, have a touchscreen user interface, can run third-party apps, music players and are camera phones. Most Smartphones produced from 2012 onwards also have high-speed mobile broadband 4G LTE internet, motion sensors, and mobile payment mechanisms.

Smartphones

Apple devices including Macs, iPhones, iPods and iPad support standard wired and wireless networking technologies, but they also utilize custom applications and some special techniques for networking with each other and with non-Apple devices. Apple manufacturers the AirPort line of wireless networking products, and has its own networking protocols, AppleTalk and AFP (Apple Filing Protocol).

Apple Networking

The iPhone is a smartphone made by Apple Inc. It and the iPad, along with several other mobile devices from Apple, run on the iOS operating system, which has its own topic, as does the iPad for device-specific questions. Native iOS applications are written in Objective-C or in Swift using the Cocoa Touch frameworks or HTML5 compiled with the help of a package manager such as Adobe PhoneGap; a common IDE is Xcode.

Verizon Wireless iPhone 4. Activate on AT&amp;T?

Verizon Wireless iPhone 4. Activate on AT&T?