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Had a iPhone 3 sync'd with my Mac/iTunes.<br />
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Purchased a iPhone 4 a while back. Sync'd that with iTunes. Now that is my primary phone. That's all I've been sync'ing recently.<br />
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I want to plug in the iPhone 3 and sync it with iTunes. Will it conflict in any way with my currently sync'd iPhone 4? Will iTunes detect that it's a different iPhone altogether?
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Had a iPhone 3 sync'd with my Mac/iTunes.

Purchased a iPhone 4 a while back. Sync'd that with iTunes. Now that is my primary phone. That's all I've been sync'ing recently.

I want to plug in the iPhone 3 and sync it with iTunes. Will it conflict in any way with my currently sync'd iPhone 4? Will iTunes detect that it's a different iPhone altogether?

Plugging in old iPhone sync

All of Apple's hardware is produced solely by Apple Inc., who determines internal systems, designs, and prices. Apple buys certain components wholesale from third-party manufacturers. The current Mac product family uses Intel x86-64 processors. All Mac models ship with at least 1 GB RAM as standard. Current Mac computers use ATI Radeon or nVidia GeForce graphics cards and include a dual-function DVD and CD burner, called the SuperDrive. Current Apple hardware includes the iPad, iPhone, iMac, Mac Pro, Macbook, iPod and Apple TV. Discontinued hardware includes the Apple I, Apple II, and the Apple III, the Lisa, the Newton, the Quadra, Performa, Centris, Macintosh II and LC series, the Power Macintosh, iBooks and the MacBook.

Apple Hardware

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.

iPhone

Programs written for the Apple operating systems are distinguished from software created for other operating systems in that it must be approved by Apple for use on its devices, whether it is from Apple (Final Cut, iWork, Keynote, Logic Pro and GarageBand are popular titles), or is a third party application from Parallels, Nuance, Microsoft and Amazon, among many others.