The Handy Tips Guide to the iPhone 4S & iPhone 4

Use it to make sure your pictures are hanging correctly and your DIY is up to scratch. An iPhone may not be as precise as a dedicated spirit level, but it's very handy.

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Either use the spirit level with your phone laid out flat or with it perched on its side in either portrait or landscape mode. If you tap the screen, you can measure the difference between two surfaces, with the red margin showing how much the two angles vary. If you spend a lot of time inside the iOS Calculator app, you know the frustration of mistyping a digit and then having to start the calculation all over again.

This hidden backspace function means you won't have to revert to the C or AC buttons every time you make a mistake. Just swipe to the left or the right at the top of the screen, where the digits are displayed. The motion acts as a backspace command, and will remove the number you entered last.

While we're talking about Calculator, have you ever put the app into landscape mode with a twist of your iPhone? This view reveals a host of extra functions. We all hand our phones over to friends when we want to share photos or videos. But what if your collection includes sensitive images you'd rather not show anyone else?

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Luckily, the iPhone makes it easy to hide your most personal pictures from view. Inside Photos, select one or more images, then tap the Share button and choose Hide. As the confirmation message says, your chosen pictures will become invisible via the Moments, Collections, and Years views, but can still be accessed through the Albums screen. In addition to letting you set alarms so you'll wake up on time, the latest version of iOS helps you keep to a given bedtime.

Open up the Clock app on your iPhone and then tap on the Bedtime link at the bottom to get started. First, your phone will ask you what time you want to wake up in the morning. When that's set, you can decide which days of the week you want the alarm to go off, and then how many hours of sleep you want each night. Your iPhone will then ping you when it's time to hit the hay, and track how well you're doing at reaching your sleep targets.

That's because the details you enter here, like your allergies and contact information for your next of kin, will appear on the lock screen when someone taps the dialer's Emergency link.

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In other words, anyone who picks up your device can access this information. So, if your phone gets lost, a helpful bystander can tap through to find a way to return it. Another, better-known way of locating a lost device is the Find My iPhone feature, which lets you track your phone on a map. Those of you who prefer a visual phone alert to an audible one will like this: You can get your iPhone's flash to light up when a notification is displayed. This could come in handy during meetings, when many people place their phones face-down on top of a table.

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To get the feature working, go into Settings and then tap General and Accessibility. If you prefer to not be disturbed at all when the phone is in silent mode, you can tell the flash not to light up then. Siri is pretty adept at working out who you want to text or call. But you can speed up the process by adding nicknames like "mom" or "Lizzie" to your contacts. In fact, Apple's Contacts app has a field especially for this, and Siri can use it to identify people. To input a nickname manually, open up any contact card, tap Edit, choose Add field, and then pick Nickname from the list.

Alternatively, just tell Siri to "call mom" or "call dad" or something similar. Then the assistant will ask you which contact that nickname belongs to—remember your answer for future use.

iPhone 4 Tips: 10 Things New Users Should Know

Sometimes, an email attachment just doesn't convey enough information on its own. So annotate it with the Mail client built into iOS. You can easily switch back to English UK for spell checking by tapping the globe button next to the space bar in any app that brings up the soft keyboard like Mail or Notes. After you've been using your iPhone for a while double-tap the Home button to see how many apps you have running - it will be more than you think! Normally you just let the iPhone decide how many it can keep running at once, but you can take matters into your own hands by killing running apps here.

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Just tap and hold on a running app and a "-" button appears against all of them. Tap this to kill the app. It's possible to quickly add a variety of accents to the letters "e" and "a" when typing on the iPhone's keyboard. If you want to change your typing to capital letters all the time, rather than just for the next letter, then double-tap on the Shift key on the iPhone's keyboard. It will now turn blue, indicating caps lock is on. Just tap it again to turn it off. The iPhone 4 has a front and rear-facing camera.

The rear-facing camera is the high quality 5 megapixel one, and the front facing camera used mainly for FaceTime video chat is lower VGA resolution. This means it's now easy to take a picture of yourself something that was pretty difficult on the previous iPhone models. In the Camera app just tap the Switch button at the top right to change cameras from rear to front.

iPhone 4 Tips: 10 Things New Users Should Know

You can also use the forward facing camera for recording video, and the iPhone 4's second microphone means it works well capturing anything you say too. In the Camera app tap the switch icon as in tip 8 then change to video mode using the slider and record a video of yourself talking. Now select it in the Camera roll then tap the Forward icon and select Email Video - job done! Organising your apps is so much easier on iPhones running iOS4. Just tap and drag apps on top of each other and you create intelligently named folders.

You can rename the folder names Apple chooses though - just tap and hold on an app to make them wiggle, then tap on the folder name and start typing.