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First of all, some context. Skype for iPhone is a voice-over-IP communications application that lets you chat with other Skype members for free, plus call landlines and mobile phones when you buy Skype Out credit. It is available in every country that the App Store can be found, and has already made a splash in the U.S., Japan, and Europe. Apple requires Skype and other voice applications to use Wi-Fi to place iPhone calls, not the hardware phone. Now, without further ado...
1. If you've already got an iPhone, what's the point of having another calling application?
At least at first, Skype was primarily used to place international calls for free to other Skype users, or to landlines at a reduced rate on par with a calling card, for example. If you've got family and friends living abroad, the application's potential is a no-brainer. Sure, you might not need to use Skype if everyone you know and love lives within a 500 mile radius of you. Yet users have already chimed in with examples of domestic uses, like if your home has a weak cellular signal but strong Wi-Fi; or if you eat through your free talk minutes, a low-rate VoIP service like Skype will cost you less than the carrier's charge for each minute you go over your plan. Also, don't forget that iPod Touch owners can use Skype and other VoIP applications (like Truphone and Fring) to make calls, even though the iPod has no telephone hardware--you just need earphones equipped with a mic.
2. If you're on the road, you still can't use your iPhone to make free calls with Skype unless you can track down a Wi-Fi connection somewhere.
If you're in the U.S., AT&T allows iPhone users free access to AT&T hotspots without incurring extra charges, though if you're attempting a call, you might not want to start it in the middle of Starbucks. Also, even when you've got a laptop or desktop handy and could use VoIP on the desktop, a calling client on the mobile phone gives you the freedom to wander. You won't be able to see your pals with the Web cam from the iPhone, though, so there is a trade off involved.
3. Does Skype for iPhone use the native iPhone address book, or a proprietary one?
Skype hooks into your iPhone's address book from the dialing screen so you can easily call a non-Skype buddy using Skype credit you've purchased. The Contacts screen shows your list of Skype contacts, and it's from here that you initiate a chat or call to Skype pals that aren't in the phone's address book.
4. Will Skype for iPhone notify me of missed messages or calls when I am running other apps, or when the iPhone is inactive?
Yes and no. You'll see notification circles of a missed message or call on the separate screens when you've got the app running, and again on the program icon if you close the application with unread chats. Yet since Apple doesn't let you have more than one application running at a time with iPhone 2.0 software, you won't get an alert if you're using another app and someone tries to reach you (you'll appear offline to them, anyhow.) Even if you do see a notification alert on the program icon after you'ce closed Skype, the number of missed calls you see won't update to reflect the current number until you sign back into Skype.
5. Can you receive calls from your SkypeIn online number when you're in a Wi-Fi hotspot?
Yep; if you've already purchased a SkypeIn number, the service should work seamlessly on the iPhone without extra activation steps.
6. Do you need a headset to make a call?
On the iPhone, you'll be able to hold the phone up to your ear as you would when using the phone, though the application is also compatible with a headset and with speakerphone. Note, though, that you will need a microphone-equipped headset when using Skype with the iPod Touch.
-----------------------------BY Jessica Dolcourt
Source：cnet
©2009 CBS Interactive Inc. All rights reserved.
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