Parents need to know that ooVoo Video Call, Text and Voice is a free app that teens can use to group video chat with up to 12 people, even if they're using different platforms (iPhone, Android, desktop computers, and more). ooVoo users also can send texts and make regular phone calls, including to international numbers (in-app purchase is required). Ads on the free version can be removed by purchasing ooVoo's premium service. The developer's terms indicate people must be 13 or older to use the app. An important privacy and safety note: Unless teens change their account settings to limit or restrict public access, anyone can search for, see, and contact them.