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If Skype for iPhone seems like a big deal to you, you're right. It's topping iPhone App Store charts in nine countries, Skype says.

The Skype for iPhone VoIP application, which became available Tuesday after an announcement at CTIA, is now the top free app in the U.S., U.K., Australia, France, Germany, Holland, Japan, Russia, and Spain.

"I'm delighted that consumers have voted with their fingertips and chosen to download Skype in such phenomenal numbers," said Skype Chief Operations Office Scott Durchslag.

You can read more about Skype for iPhone in our hands-on review or see screenshots in our slideshow.

Hot on the heels of releasing Skype for iPhone, the VoIP communications company has come to the table with news of a free, "lite" version of Skype for BlackBerry. Already downloadable for Android, Java, Symbian, and Windows Mobile, BlackBerry has remained Skype's missing link.

Just don't expect to share photos of your cat quite yet. While Skype's core capabilities will debut in Skype Lite for BlackBerry, not everything Skype can do will be available right out of the gate. You'll be able to call other Skype users for free, and can initiate calls to landlines and mobile phones using Skype Out credit. You'll also be able to receive inbound calls to your online Skype number. Instant messenger and SMS features will also stay intact, but features like voicemail and file transferring, which are also available on other platforms, will be delayed on BlackBerry for the time being. Also, unlike the iPhone version just released, you won't need Wi-Fi to connect to Skype. Skype Lite will work over your BlackBerry's data plan, so long as you have a calling plan.

Skype's announcement is just part of the company's three-pronged mobile strategy, Skype's chief operating officer, Scott Durchslag, said in a press conference on Tuesday at CTIA. Skype's first goal is to create a native application for all major smartphone operating systems. After BlackBerry, Palm's unreleased Web OS platform would be the last major hurdle. After conquering native applications, Skype will work to get its VoIP client preloaded on mobile phones and other Internet devices. To this end, Skype has already cut a deal with Nokia to be featured on the Nokia N97 when it ships. Lastly, Skype will court carriers to integrate Skype-to-Skype calling for phones that don't have Wi-Fi.

Skype plans to release a beta version of Skype for BlackBerry in May, starting with BlackBerry Bold any Curve phones, and gradually adding support for more BlackBerry smartphones. Skype Lite for BlackBerry will be available in ten countries to start with, including the U.S. and U.K., Australia, New Zealand, and Brazil, and parts of northern and eastern Europe.

Related stories:
Skype for iPhone: It's official
Skype gets SMS, file transfer for Windows Mobile

Photos: Inside Skype for iPhone

Months after teasing us at CES with an announcement of Skype's native VoIP client for the iPhone, the free Skype for iPhone will finally be available to download from the iTunes App Store sometime on Tuesday. We got a chance to sit down with the application's principal engineer before the announcement was made at CTIA 2009, to see Skype for iPhone do its thing. While most of the features aren't too surprising--Skype does want to maintain some consistency across its mobile applications, after all--there are a few capabilities that are notably missing, and a few iPhone-only perks that are refreshing to see.

At long last, Skype has come to the iPhone.

(Credit: Skype)

In terms of navigation, Skype's VoIP app for iPhone looks more like your traditional iPhone app than it does Skype 4.0 for Windows. For many who already prefer Apple's sleek interface archetype, that's a triumph, but those who enjoy Skype's branding may feel disappointed.

Skype's screens are well organized and use the iPhone's ability to add filters, for instance, to sort your contacts alphabetically, or by who's online. There's chatting as well, though Skype's flagship feature is its VoIP calling that's free to other Skype users and an inexpensive per-minute fee to landlines. Calls on Skype for iPhone work only if you're in range of a Wi-Fi network, so your call quality will in part be at the mercy and strength of wireless networks nearby--calls will not work over the cell phone network on the iPhone (but chatting will.) Assuming your connection is solid, you can dial a number or quickly call a contacts stored in your address book. iPod Touch users will need earphones with an embedded mic to talk. During a call, you can mute the line, go on hold, or put the call on speakerphone. In the My Info window, you can follow a link to buy more SkypeOut credit online.

Taking a photo from within Skype to serve as your avatar image, or pulling a picture in from the camera roll are two iPhone-only features that makes use of the phone's hardware attributes. Another imperfect, but still neat, feature is the ability to accept incoming conference calls. While you won't be able to initiate a call, we're told, you will be able to jump on one if a buddy invites you in. We hope the next version includes placing conference calls from the iPhone.

Skype bypassed a few more features in its maiden iPhone voyage. SMS, setting up a conference calling group, purchasing SkypeOut credit directly, and being able to field a second incoming Skype call are a few. File transferring and getting Skype voicemail native on the phone are two more. We expect to see at least two of these added in the next version, but we'll hope for more.

Skype versus the competition
Here's the big question on our minds: will Skype's iPhone app replace competitors like Nimbuzz and Fring, which focus on cross-network IM but also include VoIP calls with Skype pals even though they've been available for the iPhone for months? Kurt Thywissen, the principal engineer for Skype for iPhone, thinks so. He says what the other apps use is a workaround that requires them to channel calls through a server and transcode audio, resulting in poorer-quality calls than Skype can do in its own app. He may be right, but those who IM more than they vocalize probably won't ditch the likes of Fring too soon. They might, however, let Skype handle the calls and let another app take care of the multinetwork chatting.

Inside Skype for iPhone--photos

Talkster has been getting some buzz from fellow CTIA-goers. The new international dialing service is offering free global calls in exchange to listening to a few ads. The VoIP-based, phone-centered service feels like the perfect Skype (download) and Pincity mashup. It's free like Skype, and also relies on a VoIP backbone, but like Pincity, Talkster makes use of local numbers to initiate mobile and landline calls.

It sure sounds irresistible, and I've read a few glowing reviews, but in actuality it's a bit tricky. Talkster members enter their number and the number they're calling, and Talkster assigns a new, local number for callers on each end of the line. Say what?

If I want to call my sister in England, I enter both our phone numbers and receive a third number in my 415 area code. That's my permanent number for the phone number I just entered. My sister will get a number for me too. If I want to catch her at home, work, and on her cell phone for free, I'll need to enter each phone number and get three separate Talkster lines.

It wouldn't be so confusing if that were all, but of course it's not. Initiating a call isn't merely the result of dialing one of my Talkster-issued local numbers. There's an order to the calling system. Let's say I initiate the call to my darling sib using a Talkster phone number. I dial the appointed number in my area code and she picks up. But we can't talk yet. She first has to hang up while I stay on the line. My sister then quickly locates her local number, and while Talkster servers do some speedy math to connect our loose ends together, we both listen to an ad. Or that's the plan as soon as Talkster's ad deals are in place.... Read more

NoiseFree VoIP has just launched a fresh all-software solution to those often noisy VoIP calls. Skype, Yahoo Messenger with Voice, and Google Talk are great ways to save money on long distance, but if you're calling anywhere near civilization, you're bound to get interference. A noisy line can undo the advantage of free Internet calls.

Until December 31, 2007, NoiseFree VoIP is offering a free beta of its noise-canceling software to registered users. I gave it a go at CTIA (coverage), and was impressed with the demo. There was noticeable improvement in call quality when I toggled the software on and off, though the background buzz in the busy room didn't and couldn't have faded completely.

NoiseFree VoIP launches as a window that detects when you use VoIP. It doesn't add on to or interfere with your voice program of choice, operating invisibly. The app window can be set to start with Windows or with a browser launch. It minimizes to the system tray and can be called on for a few very minor tweaks.

NoiseFree VoIP is Windows XP and Vista-ready. Download NoiseFree VoIP for free from CNET Download.com.