How much free space should you leave on the phone?

As much or as little as you want, as it has its own separate RAM. However, if you take a lot of pictures, then you may want to leave more.

TEG

dranakin said:

Wondering what is a good amount of free space to leave on the iPhone, as it is a mini-computer and all.

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I would leave at least a couple hundred MB (0.1-0.2 GB) in case any application needs to save data.

ye, always good to leave a little bit incase that once-in-a-lifetime picture moment doesn't happen because you can't save the photo!

Alot! It's none of your business!

CharQuake said:

Alot! It's none of your business!

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That doesn't even make sense... the OP asked how much SHOULD you leave free, not how much DO you have free.

Before I bought a 16GB 3G, I filled my 8GB almost to its limit... leaving about 30-40MB free. Didn't see any change whatsoever in the performance of the phone.

I have filled my iPhone up before and had it work just fine

So, none....