Why did vodafone charge my iphone viber calls?

Jsy

New member
I'm using my iphone 3 given to me by my sister in HK. I insert a contract vodafone sim card in this phone and everything works ok, except for the viber calls. Vodafone charged me about ?50 for a 45-min call recently. They insisted that it was an international call and not a viber call!! Now I dare not use the viber apps anymore. I don't know if the phone had been locked in HK but I didn't have to unlock it in order to use my vodafone sim card with it.
 
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