No smartphone apps with ios systems. 2. The functions only work with memory card: browser, facebook, file manager, audio player, twitter, viewer whatsapp.image, audio recording. 4. It is not waterproof. 5. Some functions like Notification, app downloads are not currently available on Apple iphone. 6. Load at least 12 hours at the first use.Multiple functions: great for being a smart watch for fitness tracker, which can perform activity tracker, sleep monitor, pedometer, sedentary reminder, basic functions such as dialer, call logs, message, anti-lost, alarm, image viewer , calculator, audio player, audio recording, remote notification, call notification and power saving mode.Functions of the social network including whatsapp, twitter, facebook and browser.