Good investment how? They are free with contract now I believe. So, other than having a contract, you don't have a lot to lose. But, for a 12 year old, you need an otterbox! Drops are a guarantee and they are great protection and no more than $20 on eBay! The 3GS is a good phone, but lacks the nice bright screen and great camera of the 4 and 4s.
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