How to get best rates on international calls? 

You can go surfing the internet and find many sites that offer their own rates for international calls. But go site by site take you long. Better go to a site that allows you to compare rates from different providers prepaid phone cards. In a place like this, usually you can compare the features of the phone cards with just one click. An example of this can be seen here.

Some providers callig cards are:
ECC (eurocallingcards) cards: Jupiter, Royal Call, Saturn
IDT cards: El Toro, Everest, Mozart, Sahara, Tigris
NTC (National Telecom Corporation) cards: Bizon, Cardinal, Champion, Cheap Call, CheapStreet, FastWorld, Lucky Minutes, Partner, Penny Boss, Solaris
NW-IP cards: Continental, Golden Lotus, Hello from UK, Mariachi, Simply
RNT cards: Arbat

As you can see, some providers offer phone cards for europe, others for asia, and some others for U.S. and so on.

If you do a comparison before buying surely you will find a good rate.

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