Why can't I add music from two computers? So very, very annoying...

Hmmm... It appears it's more fun to have folks tell you it can't be done, rather than tell you how it certainly can be done.... You said:

1. Can I add music to my iPhone 4 from two different computers?

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Both computers are running Win7 and latest iTunes.

You bet... Go to iTunes on both computers and share your media libraries via iTunes Home Sharing - using the feature "Manually Transfer iTunes Content to your iTunes library"...

http://support.apple.com/kb/ht3819

While you will only be able to "sync" your iPhone to one computer - your media library on your other computer can be synced to it as well, via that iTunes connection.

Hope this helps,

John

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The problem comes when I don't want to transfer 20+ GB of music to my laptop.

Terrible design flaw? Do you think wheel locks are a terrible idea when they prevent people from stealing your tires? The same principle applies here.

You can blame restrictions such as these on people who don't pay for their music and steal it from limewire, etc.

A simple fix would be to put all of your media onto one computer, or in a centralized location such as an external drive.

I can't believe that people keep using that argument.

This weird restriction is present only in the IPHONE. On the IPOD TOUCH you can manually add music from any computer running iTunes.

The sad part is that Apple has never said why, just that "the iphone is intended to be used on a single computer".

Dont forget that almost every other device out there intended for storing and playing MP3's also does not have the same restriction. For that reason and like Wanny continues to try explaining this affects only the iPhone not iPods, i dont buy the "deliberate restriction imposed by the music labels" otherwise it would affect ALL MP3 devices.

iPhone, "the first SOPA friendly device"

you can debate the issue until the cows come home. Bottom line is you CANNOT synch the iPhone with more than one iTunes library at a time. Why? Because that's what Apple has decided. End of discussion.

"End of discussion"? Are you an Apple employee?

"Because that's what Apple has decided"? And WHY Apple decided that? Why didn't do the same with the iPod Touch?

And WHY Apple decided that? Why didn't do the same with the iPod Touch?

Agree that it doesn't make sense but no one here or anywhere else can answer your questions. You can debate it all you want, but you will never get an answer.

Well i found the fix, tested and its working. Unfortunately since I am sure posting here would be violation somehow, I wont be sharing it, just now its out there, is very easy and isnt difficult to find.

I will however give you a clue to the technical reason to why you cant sync with multiple computers. The itunes library has a persistent ID for controlling this functionality among other things. If that ID were updated to match that of another library, then it achieves what your looking for and let you add songs from multiple libraries.

Just to add, actually doing this might be considered illegal since its modifications to a protected product.