【實用社交app】Callbacker – cheap calls|最夯免費app-綠色工廠好玩App

High quality free calls as well as cheap long-distance and international calls and SMS! We have the cheapest rates for non-Internet calls (callback calls). It’s easy and cheap! Now you can use Callbacker to make free calls between apps! Due to our newest developments, we have achieved unrivaled voice quality even with poor Internet connections. Using push-notifications mechanism you can receive calls even with the app not launched, which saves the phone battery charge and network traffic. The new voice engine has also enabled excellent quality for calls to mobile numbers in many countries. This quality exceeds the quality of our competitors’ phone calls! Finally with Callbacker app, the affordable telephone communication has become much easier to use! Use in-app one-click action to top up your balance. No credit cards, awkward navigation or tedious sign-up forms. Add money via the iTunes® account directly! We are constantly working to maintain high connection quality to ensure adequate communication while we are also looking for ways to cut down per-minute cost for popular destinations. Key app benefits: – High voice quality regardless of the call type. Clear sound! – Free incoming calls even with the app not launched. – Instant Callbacker account top-up using your iTunes® account. – Internet calls employing callback and VoIP (SIP) technology. – Telephone calls via SMS with no Internet connection (SMS-callback) . – A simple and user-friendly interface will help you enjoy your Callbacker on daily basis. – Callbacker does not require a separate address book. All your contacts are immediately available in the app.- Free instant messaging with your Callbacker's contacts.Nothing makes saving on mobile network easier than Callbacker! Rates and conditions are available at http://www.callbacker.com/rates-ios.html