Αre your free minutes too few? Are you calling abroad a lot of times? Voip is here to save you a tone of money. But let me expain.
Voip is meaning Voice Over IP, so you probably already using voip with apps like Facebook Messenger, Whatsapp, Viber etc. But all these apps have terible service and every time the call starts by "CAN YOU HEAR ME?".
There is an easy way to make every call from your mobile phone to any number around the world and this is Betamax. Betamax is a central voip provider which has a lot of brands. In this link http://www.voip-comparison.com/ you can find all the brands and the prices per minute for all the destinations. So you just make a search for the country of interest and you found which provider is the cheaper. Then you create an account on the provider, you add balance and start making calls.
Istructions
1) Go to http://www.voip-comparison.com/
2) Make a search with your calling destination (or 2,3...destinations)
3) Found the cheaper brand or that you like more
4) Go to brands website and create an account
5) Register your phone number via the brands website
6) Download the app from appstore or playstore
7) Login to the app whith the account
8) Start talking because finaly is cheap
Pros
1) Cheap calls
2) Works like prepaid phone
3) Balance never expires
4) Easy to use, just need to install an app
5) Some providers have FREE days for certain destinatios
6) The reciever watches the number you calling from
7) Many ways to add balance (starting from 5€)
Cons
1) Expensive for Asia and Africa