leonardogoncalves wrote:
imagine using a 16GB iphone like me; you already loose almost 2.77GB just for IOS7.
iOS 7 does not take up 2.77 GB, not even close. If you've ever restored your iPhone without loading a backup, i.e. getting back to out-of-the-box state, you'd see that you have your full capacity, minus a few hundred MB of Other (which may or may not be iOS). What you could be confused about, which is common, is that 16 GB is never really 16 GB due to how storage space is advertised vs. how it is actually counted. At best, for a 16 GB iPhone you'll have "only" 14.9 GB of actual storage, which applies to any storage medium not just iPhone.
then you loose 1,11GB to what they call "documents and settings" (which they do not specify).
There is no "documents and settings" catagory that I can see, but there is a "Documents and Data" category under iCloud usage (but that's iCloud and obviously not the storage on your iPhone) and also under the breakdown by app when you select it under Settings/General/Usage. Shouldn't be a mystery as to what's taking up space or why.
then you loose 1.75GB for somthing called "others" (which they DEFINITELY do not specify)
You're right in that Other is not specified, but that's because it can be a huge variety of things ranging from song artwork, media saved in text messages, corrupted synchronization to iTunes -- many possible things. Having 1.75 GB of Other is a bit high but not unusual, and you can try reducing it by restoring the device and re-loading content (with or without your backup).
and then, in my case, you loose 7+ or more GB for emails. that leaves you with a little more than 3GB on a 16GB phone!!!
Your Gmail will only take up as much space as the attachments you download within each message ... just having the messages in your Inbox does not occupy much space. More space is taken only when you choose to download an attachment in a message. I have 7 years worth of Gmail in my Inbox, and according to my iPhone the Mail app is taking up 84 MB of space. I have hundreds of emails with photos, movies, etc., but I don't need to download each attachment, just the ones I feel I need to see on my iPhone.
So it should be no problem holding 10,000 emails on your iPhone, just don't download every single attachment in your Inbox.