Can I use VoIP apps? e.g. Skype KH December 05, 2018 09:10 Updated Follow Yes, VoIP applications are supported. Examples of supported applications are Skype, Line, Viber, WhatsApp, and KakaoTalk. Related articles I have never used a Pocket WiFi before, what is it ? How many devices can connect simultaneously? How long does the battery last? Can it be used outside of Japan? Is there any settings required for the Pocket WiFi? Comments 0 comments Please sign in to leave a comment.