For cases where you're calling the US (admittedly probably not too often if you live in the UK) you can use the free app Talkatone (available on both iOS and An

For cases where you're calling the US (admittedly probably not too often if you live in the UK) you can use the free app Talkatone (available on both iOS and Android). It's super useful if you're an American traveling abroad: just find WiFi (or a local data SIM card) and you can call all your peepz back home.