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What is a network calling card?

This is not clear. Cloud Netcom VoIP is a high-quality calling software. The software connects you with the called party by calling back, so that the two parties can talk in real time. Yunnetcom provides users with 30 yuan monthly cards, 50 yuan and 100 yuan prepaid cards and other products, so that users can save 90% of the phone bill every month when making calls.