Switching Memory From 1 Iphone 3GS To Another?

Is there any business / place where an expert can do this for me or any tutorials?
PS, it was badly cracked, so the memory card is still ok.

The iPhone is not designed to accommodate switching of memory modules. But you shouldn't have to do so, as you should be able to back up and restore the contents of the phone if you're on a recent version of iOS (the 3GS can be upgraded as far as iOS 6.1.3).

For the record iPhones don't have or use memory cards. That most likely is the SIM card you are referring to.

Transferring data from 1 to the next is simple as backing up the old & restoring from that backup on the new using iTunes.

That's it.

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