XXSIM and Viber have forged a unique partnership in order to provide free calls from Viber to all XXSIM numbers!
When the feature is activated, Viber users can call XXSIM numbers for free using special dialing format +372800XXXXXXXX, where XXXXXXXX is a XXSIM number. Contact XXSIM Support to activate this feature for your XXSIM!/
The call is free for Viber user. The cost of incoming Viber call for XXSIM user is incoming call rate in the host country plus 0.15EUR per minute. In case XXSIM user is in the country with free incoming calls, the cost will be just 0.15EUR per minute!