81% of all smartphones are powered by Linux. Keep tabs on the ever changing privacy policy. Its up to each user if this is ok or not. Viber continues to scan and also save your contacts’ phone numbers from your address book on their servers. However, unlike other apps, which only scan your contacts. You can even use Whistle Phone with other SIP credentials.Update: Over the past couple of months Viber has been modifying their privacy policy to help increase user confidence. Unlike Viber, Whistle Phone gives you a free DID number and free outbound calls to PSTN numbers (with 15s commercial) as well as free Whistle Phone calls to other Whistle Phone users. It's not a bad mobile VoIP app, but I still prefer Whistle Phone. It does have a nifty Invite feature within the Contacts screen to quickly invite someone to Viber. So it is a bit limiting in that you need other Viber users for this to be effective. If you attempt to call a non-Viber user, it simply defaults to the iPhone's GSM connection and dialer. The app supports Bluetooth headsets as well. However, even if you don't have it running in the background, you can still receive a push notification, click 'Answer', and then the app is launched to accept the call. The nice thing about Viber is that it can run in the background and receive phone calls. Then after allowing the app to view your contacts, you can see which of your contacts are also Viber users (icon indicator) and initiate a free VoIP call over WiFi or 3G. Once you launch the app it asks your cell phone number and then sends a SMS with a PIN to confirm that is indeed your number.
Once they join, calls to them are free and with higher quality than traditional GSM cell calls. The catch is in order to make phone calls your friends also have to be Viber users. Instead, your phone number is your username.
Viber's claim to fame is that it doesn't use buddy lists or require registration. There are plenty of mobile VoIP apps for the iPhone, but each has its weakness, including Skype, which is a battery hog. Viber, a mobile VoIP app for the iPhone launched today.
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