Upptalk is an app for iPhone, Android and Kindle that offers you FREE unlimited calls from the app to UK landlines. It also gives you a UK number for devices that cannot take SIM cards such as tablets. Just download it from the App Store or Google Play and start making your free calls.
To get free unlimited calls to UK landlines, download the Upptalk app from the App Store for Apple devices or Google Play for Android devices. The app works similar to Skype and Viber.
Very useful for people who live in areas with poor signal but are connected to WiFi.