Source: http://www.engadget.com/2013/10/29/virgin-media-smartcall-app/
Those of you with long memories will recall that Virgin Media announced a WiFi calling platform way back in November 2012. Nearly a year later, and the company is finally offering the system to Android and iOS users. Virgin Media SmartCall is an app that lets you make calls while roaming and charge them to your home package,cutting the cost of getting in touch with your nearest and dearest. It'll also let you make international calls through the app, and you'll be charged as if you were making the call from your domicile. Either way, nice to know that someone's looking after your wallet in these straightened times, eh?
Source: Google Play, App Store