Old iPhone 4 as iPod?

Now that I have my new iPhone 5, I gave my wife my old iPhone 4S, which now leaves us with her old iPhone 4 as free (which is in excellent condition as my wife babied it). My daughter currently has a 4th gen iPod touch, and I was considering upgrading her iPod touch this Christmas to the new iPod touch, but when I started thinking about it, I'm thinking I could just give her the old iPhone 4, as it has 90% of the features as the new iPod. (ie - Retina, 5mp camera, HD video). The only differences I really see are the dual core A5 [ipod] vs A4 [iphone 4] and the 4 inch screen [ipod] vs 3.5 inch screen [iphone 4]. If I upgrade to ios6, I'll get most of the new features, but not all (diff between iP4 vs iP5 vs new iPod). But if I do this, I can save ourselves $299, and get her something else nice for Christmas.

Can anyone see any problems or issues with this plan that I'm not thinking of?

The phone has a deactived AT&T chip in it now, so all the other features work on it, but it has no cellular connection. The only thing I'm worried about is there anyway to disable the automatic 911 feature on the device? I know all phones have to be able to dial 911 if a person does so on a cell phone, even if there is no active cellular service. My daughter is very responsible, and I know I can trust her not to do that, but I'm more worried about friends doing something stupid like that.

Any thoughts/comments?

From A Buick 8 said:

So what did you decide?

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I decided to just go ahead with my plan, and had a long talk with her about the ability to dial 911, and how she would have to make sure she doesn't do it, unless she's truly in an emergency situation. She's responsible enough that I can trust her not too.

So far, it's worked out very well. She likes the better camera so much more and the sharper Retina screen, and the better processing power. Plus, she loves to tell her friends that she (technically) "has an iPhone 4". Doesn't matter that it has a deactivated sim card and she can't make calls....

Overall, I think it was worth it, as it saved us from having to spend $299 on a new iPod Touch 5th Gen and she's happy with it too.

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Breaking Good said:

I don't think what you are proposing is a bad idea and if your daughter is responsible it might be nice having the 911 feature just in case.

I don't think you can deactivate the 911 feature.

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Yeah, when I started thinking about it, I figured it wouldn't be a bad idea to have that ability. God forbid something ever happened where she'd need it, I be glad she have it as a safety net.