How do I change the computer that is synced with my iPhone without erasing fileson either devise?

Every time I try to change the computer, that I first registered my iPhone to, it says that I will lose all the files that I have purchased. Now I think that is stupid and I am not going to re-purchase everything. Especially when I was under the undestanding that the iPhone was portable between computers.

By: gheckoau2002

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