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Libon for iOS review: Great for free calls, but with strings attached

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All from the same window, you can send text messages, add images and sound clips, or hit the call button to talk directly. Screenshot by Jason Parker/CNET

The customized greetings aren't just limited to what you can record, either. Instead, you can type your voice mail greeting, and choose from several synthesized voices to read it to incoming callers. The voices range from serious to silly, but all are in an English accent. While they're not perfect, it will be great for those times when speaking your greeting just doesn't seem to come out the way you want it to.

Call quality
In my testing around the office and the calls sounded great. Libon isn't over the air like your regular phone; it uses your data plan for calls, voice mails, and everything else. To test just how much data, I used two iPhone 5s, with one on AT&T and the other on Verizon. Both use LTE data connections. A coworker and I sent text messages, images, audio clips, and both of us left 30-second voice mails. When I checked the data usage afterward, the entire flurry of activity amounted to just over 1MB of data. In other words, even though you may have data limits, it is unlikely that you will use up a significant amount of data using Libon.

Those with a smaller data plan may need to stay aware if they're getting close to their limit, but for the most part, Libon probably won't be your biggest data hog. One thing I did notice in testing the calling features was that you definitely need a strong 4G connection, as some calls would drop in areas of our office where we knew the signal was fairly weak.

One thing that I couldn't figure out was how to create an avatar for myself or for another contact. Whether you go through contacts or settings, there doesn't seem to be a way to upload a photo. It does already display most people's photos in my contact list through Facebook, but even when both my coworker and I signed in to Facebook, still we had no profile pics.

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Instead of recording a voice mail greeting with your own voice, you can choose from several premade voice types that will read out your typed greeting to incoming callers. Screenshot by Jason Parker/CNET

You can download Libon for free right now at the App Store and chat or make calls with other users who also have the app at no charge. The free version only allows you to make three personalized voice greetings. But if you sign up for $2.99 a month, you'll get unlimited custom voice mail greetings, and you'll be able to call people on any mobile phone or landline internationally. The major drawback is that even with this subscription, you only get 60 minutes of domestic and international calls (to landlines or non-Libon users) per month. You'll still get unlimited free calls as long as both parties have Libon, though.

If you can get your friends to download it, Libon is a great for making free calls and sending texts between users of the app. Whatsapp Messenger users seemed to have no trouble getting their friends to download the app, so the ability to make free calls will probably be an easy sell for Libon as well. It's true the subscription plan leaves a lot to be desired, but if you can keep your calls exclusive to other Libon users, it won't be a problem.

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