Skype is a software application mainly used for video calling, while Viber is useful for international phone calls.
One can go on a messaging and photo sharing spree on WhatsApp.
Viber can be used on iPhone, IPad, Android smart phones and Blackberry as well as Nokia, Windows and Bada devices.
"The latest mobile apps are advantageous for couples. Even when you are loaded with work, a smile icon sent on WhatsApp acts as a stress buster. Viber and We Chat help me maintain a beautiful relationship with my fiance who is in the UAE," said Delhi-based Priya Sood, who is planning a surprise for her partner on Viber.
