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With the addition of a 720p HD camera and the iMovie video editing app, the iPhone 4  is a mobile-video powerhouse. But HD video creates large files and the iPhone 4 tops out at just 32GB of storage, so the question is: how much video can you record on the iPhone 4?

The answer comes in two parts: video size and storage.

Video size
For the sake of this article, I’ll assume you’re shooting video at the highest-quality HD settings the iPhone 4 offers. In that case, a 1-hour video will take up about 4.73 GB of storage space on the iPhone.

Storage
Knowing that 1 hour of video take up 4.73 GB of storage doesn’t quite tell you how much video the iPhone 4 can hold. That will be determined in part by what else you have loaded on the phone.

Since most users will have some apps and some music, in addition to the OS, let’s assume that the average user will have at least 10 GB of content already on the phone. In that case, the iPhone 4 can hold the following amount of video:

16 GB model – 1 hour
32 GB model – 4 hours

On the first-generation iPhone, disk space is at a premium. With just 4GB, 8GB, or 16GB available to hold music, movies, calendars, contacts, and photos, it seems there’s never quite enough room for it all.

But there are ways to free up some disk space on your phone for the things you want more. One of them is to carefully manage how you store and delete email.

Email isn’t likely to take up a huge amount of space on your phone unless you get a lot of attachments or have many accounts configured (I have six on my phone, so any little bit helps). Still, there are two ways you can tweak your iPhone email settings to save disk space.
Download Fewer Emails

You can limit the number of emails that your iPhone downloads for each email account you have configured. Needless to say, the fewer emails downloaded, the less disk space they’ll take up.

* To set this limit low, tap “Settings” from the home screen.
* Tap Mail.
* In the Mail Settings screen, scroll to the middle subheading called “Messages.” In the “Show” line, you can set the phone to show only your most recent 25, 50, 75, 100, or 200 messages. The lower the number you use, the less disk space the emails will take up.

Delete Emails Sooner

When you delete an email on the iPhone, the disk space isn’t immediately freed up. Instead, that happens when the iPhone periodically clears deleted content from its memory.

You can free up disk space by making sure the phone clears those messages faster.

* To do this, tap “Settings” from the home screen.
* Tap Mail.
* Tap the email account you want to change.
* In the account page, tap “Advanced.”
* In the middle of the Advanced page, there’s a subheading called “Deleted Messages.”
* Tap that and then set the iPhone to remove deleted messages after one day or one week. That weay, you won’t have many deleted messages hanging around your phone, taking up space.

The iPhone can hold a running list of all the email that’s been sent to the email accounts you’ve configured the phone to check. But you won’t want to save some email — spam, annoying messages, things with large attachments that you don’t want to view on the iPhone. In that case, you’ll want to delete email. Here are four very simple steps to deleting iPhone email:
Difficulty: Easy
Time Required: 1-3 Minutes
Here’s How:

1. Go into your email and view your email account inbox.
2. To delete a message, quickly run your finger from left to right over the message you wish to delete.
3. This will produce a red “delete” button at the right of the message.
4. Tap that and the email will be deleted from your iPhone.

The iPhone 3GS  isn’t the first smartphone that can record video. The twist that Apple gave the 3GS is that not only can you record video, but you can also edit videos and share them via email, text message, or YouTube.

Because the iPhone 3GS is a phone, don’t expect a full-featured video editor. Video editors that include intensive features like effects and sound editing require complex, and often-expensive, desktop video editing programs. That’s just not possible on a phone with a touch interface. What the 3GS’ editor will let you do is trim and snip videos, so you can save just the good part of a recording.
Difficulty: Average
Time Required: A few minutes
Here’s How:

1. To edit a video, you’ll of course need to have recorded video on your 3GS. Once you’ve done that, you’ll need to go to your Camera Roll to edit (if you just took the video, simply click the box in the lower left corner. If you’re looking to edit a video taken earlier, tap on the Photos app, then Camera Roll, and find the video you want to edit).
2. At the top of the window, you’ll see a timeline bar showing frames from throughout your video. A small silver bar rests on top of the timeline bar. You can tap and drag the silver bar to move forward and backward throughout the video. This lets you quickly get to the part of the video you want to edit.
3.

To edit the video – which, remember, means just trimming footage off one end or the other – tap and hold either end of the timeline bar (there are two little lines at each end of the bar). At this point, the bar will turn yellow and a button labeled “trim” will appear above the timeline bar.

Drag either end of the yellow bar to cut out the parts of the video you don’t want to save. The section of the video shown within the yellow bar is what you’ll be saving.
4.

When you’re happy with your selection, tap the “Trim” button at the top right. You’ll be given two options: Trim Original or Save as New Clip. If you choose Trim Original, you cut from the original video and will permanently delete the sections you remove. If you choose this, be sure you’re making the right decision: there’s no undoing it; the video will be gone.

for more flexibility, choose Save as New Clip. This will save the trimmed version of the video as a new file on your iPhone, allowing you to view the new clip, but also return to the old one to make other edits if you’re not happy with your handiwork.
5.

Once you’ve created and saved the clip as you want it, you’ve got four options for what to do with it. You can simply save it and then sync it to your computer as normal. But, if you tap the arrow button at the bottom left of the screen, you’ll have three options: Email Video, MMS, or Send to YouTube.

Choosing email will email the video to any address from your phone. Choosing MMS will send the video as a text message. Send to YouTube will automatically format the video for YouTube and post it to your account (this requires a YouTube account) for all the world to see.