Support How do I transfer contacts myself? Need answer asap.

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http://androidforums.com – Silly question probably but I'm wanting to purchase another S3 for my wife for Christmas. By keeping it a surprise I cannot take her captivate in and transfer numbers so I would have to do it myself. Is it going to be painless? Hopefully I can get answer soon as my window for getting it is today. Thanks in advance. (General)