A new app has made it possible to make calls on landline and cell phones for free in 85 countries.
Call+ app lets you make free calls to landline and mobile phones alike without anyone needing the app at the other end, CNET reported.
Available for Android and iOS devices, Call+ lets you call both landlines and mobiles and it shows your existing phone number as the caller ID.
You can make unlimited free calls to anyone in the continental US and landlines in Mexico, China and Brazil.
But if you want to call a different country, you have two options.
You can buy one day of unlimited-calling service for 99 cents, two days for $1.99 and a month for $19.99.
Unlike smartphone apps that need both phones to have the app installed, the Call+ app allows free voice calls even to phones without the app.
Call+ also allows users to complete various "partner" offers in exchange for days of service.
Signing up with dating service Zoosk can earn you seven days or buying a customised holiday ornament from Personal Creations can earn you seven days.
Earning many of the offers only requires users to spend some more time, the report added.