Skype, however, can call regular phone numbers. WhatsApp can’t call landline numbers so if you think you’re calling one with WhatsApp you may actually be making a regular phone call via your device’s default phone app by mistake. For example, if you are trying to call someone in Brazil (country code 55), in the city of Rio de Janeiro (city code 21), you would dial 011 – 55 – 21 – XXXX-XXXX.

To call a phone in another country, dial 011, and then the code for the country you are calling, the area or city code, and the phone number. How do I make an international call on my cell phone? In 2014, it was acquired by Rakuten for $900 million. Founded in 2010, Viber has grown to become one of the world’s most downloaded messaging platforms. Viber makes money via fees generated from its business account, subscription fees for international calls (Viber Out), as well as ads shown within the app. As for text messages, they are under 1Kb (125 B) per 500 characters. If you want to use Viber while you are connected to your cellular data, it will consume nearly 240 KB per minute up and down, and 14 MB per hour up and down. Viber requires either a 3G or Wi-Fi connection to work and if you’re not connected to a Wi-Fi network, it will use your 3G data to place calls or send texts. The receiver of your call doesn’t need to be connected to the internet however, they need to be in an area that can receive phone calls. Your carrier will not charge standard calling fees. The others I've found are ID mobile PAYG who offer calls at 2p/min and match Three's PAYG UK rates or Giffgaff who do landlines for 2p/min but then are much more expensive for UK rates, unless you buy a bundle.You need to be connected to the internet (mobile data or wifi) to make a Viber Out call. So far the best I seem to be able to find is a Vodafone pay monthly contract for £11pm that has a really poor data allowance and then the £7.50 addon for 500 international minutes. I've been looking at getting her a SIM that has cheap international calls. She currently doesn't have a landline but with £20 would be able to get one with just UK calls, and then her parents have free international calls to UK landlines so would just be able to call there. However, she's experienced lots of trouble with Skype and Viber call quality so is looking to cut out a service such as Skype or Viber and make the calls directly from mobile/landline.

So my mum currently has a Three PAYG sim, and uses a Skype subscription to call her parents who live in Greece.

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