Turn This Off On Your Viber To Avoid Roaming Charges
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When traveling and you want to avoid bill shock from roaming charges, you can use Viber for calls, especially when there's wifi (say, in a hotel). Just don't forget to turn off "Viber-In Calls" on your settings. If you keep this on, your Viber calls could be diverted to regular roaming calls, with roaming charges.