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Now, let's take a look at what you can do with an iPhone during a call. So, my phone is ringing now and I'll answer it. Whether you place the phone call or whether you answer to an incoming call, these are the six buttons you'll see during the call. Now, you'll only see these buttons if you're not holding the phone up to your ear. The iPhone has a built-in proximity sensor that detects when you're holding the phone up to your ear. The sensor is located above the earpiece speaker. Notice, if I hold my finger over that area the screen goes dark. This actually serves a number of purposes. First of all, they can be distracting to hold a brightly-lit screen to your face especially if you're in a dimly-lit room.
More importantly though, this also temporarily deactivates the screen's touch sensitivity, which prevents you from accidentally tapping buttons with your cheek, and of course, having the screen turned off, especially during long phone calls, conserves battery power. But the second you take the phone away from your head, the screen turns back on and you have instant access to your phone. Incidentally, the iPhone's ambient light sensor's also located around this area and it gauges the amount of light where you currently are and can adjust your screen's brightness to save power. You can adjust your screen's brightness settings in the Settings area and we'll look at this in a later chapter.
By the way, if you're looking to purchase a case for your iPhone, make sure it doesn't cover too much of the proximity sensor area where that it's not so thick that it keeps your ears a slight distance away from the earpiece. If your ear gets too far away from the phone the screen will reactivate, and some people have found that they accidentally bumped buttons like the speaker phone when they're using certain cases. Okay, so we're on a call; let's look at these buttons. The first one is the Mute button. Tap it once and the person on the other line won't be able to hear you, but you'll still be able to hear them. This is useful if you need to talk to someone in the room with you without the caller on the line hearing you.
I use this all the time when I'm on conference calls. I'll tap the Mute button while I'm listening in and I don't have to worry about people hearing me clear my throat or typing e-mails. Tap the Mute button again to turn it off. Similar to the Mute button is the Hold button. On the iPhone4 and later you get to the Hold button by holding down on the Mute button until it says hold. On the iPhone 3GS, the Hold button appears where the Facetime button on the 4 and 4S's, since the 3GS has no camera to support Facetime. So, when a call is not on hold neither you nor the person on the other line will be able to hear each other, unlike when a call is simply muted in which you can still hear the other caller but they can't hear you.
Again, maybe you're on a conference call, and someone comes into the room to talk to you. You can tap the Hold button so you're not trying to listen to the call and the person in the room with you at the same time. If you're on an iPhone 3GS or 4, tap Hold once to return to the call. If you're on a 4S, you have to double -tap the Hold button to turn it off. Next is the Keypad, which is for those times when you need to input touch tones during the call. For example, if you're calling a company's customer service line, you might hear something like touch 1 for technical support, touch 2 for sales, and so on. All you have to do is tap Keypad and touching the numbers will send the touch tones over the line.
You also have the option to end the call from here if you're done talking so you don't have to first hide the keypad to hang up. But if you're still on the call, tap Hide Keypad to return to the 6 in-call buttons. Next to Keypad is Speaker. This is how you turn on the speaker phone during the call. So, if you're on a conference call where you're mostly listening in, you might want to tap Speaker so you can place your phone down on your desk and still hear what people are saying. Remember that both the speaker and the microphone are along the bottom of the iPhone, so keep that in facing you when you have the phone sitting on your desk. Tap Speaker again to return the audio to your earpiece speaker or if you're using the iPhone's earbud headset, turning off Speaker will return the call's audio to your earbuds.
Now, one of the things to know about the speaker button is that it will change if you're using a Bluetooth headset to talk during your call. In that case, the button will be labeled Audio instead of Speaker and you'll be able to tap it to route your call between your Bluetooth headset and your speaker. We'll look more at this in the upcoming movie on using Bluetooth headsets. Below Speaker, we have Contacts. Tapping Contacts opens your address book so you can look up numbers and e-mail addresses, which can be useful if you need to give information to the person you're talking to. You can also make a second call from here if you need to talk to someone else during your current call or you need to set up a conference call.
We'll look more closely at conference calls in an upcoming movie. To return back to the in-call screen after you've opened Contacts, just tap the green area at the top of the screen. And the button on the bottom left is the Add Call button, which is for creating conference calls, and again we'll take a look at that topic in its own movie. Now, you're not limited to just using these 6 buttons during a call. You can press the Home button to go to your home screen and open other applications. For example, maybe you are planning a trip with the person on the other line and you want to check the weather for that weekend. Notice the green to return to call area remains at the top of the screen.
You may come across some apps that won't work while you're on a call but let's say the majority of them do. So, during a call you can check the weather, refer to your calendar or do any number of other things. Multitasking also works during a call. So you can just double-click the Home button to run other apps and again, just touch the green area at the top of the screen to return to the in-call screen. Other buttons you can press during your call include the Volume buttons, which adjust the volume of your call. Now, this depends on if you've set the Volume buttons to adjust the call volume in your settings. We looked at that option a little earlier. The only button you want to be careful with is the Sleep/Wake button.
Pressing that button ends the call; so unless you mean to hang-up, don't press it. Your screen will dim itself and eventually turn off if you don't touch anything, and tapping the screen once turns it back on but there is no way to manually put the screen to sleep during a call. Alright, so those are the many options that are available to you during a call with the exception on making a conference call and using the Facetime feature but again, we'll look at those topics in their own movies.
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