Note: Please open the rear cover and put the battery into the base according to the arrow of direction mark. Important Features Micro SIM card (Frequency GSM/GPRS 850/900/1800/1900) (not included), 32GB SD card (not included),totally English supported FAQ 1.What is required Android version and Bluetooth version for a smartphone to work with this watch? For Android phone, it supports Android version 3.0 or higher.For iPhone, it supports iOS 7.0 or higher. 2.How to understand that it can be used as a standalone phone? When you insert a micro SIM card & SD card, it can be used to make calls, recieve or send texts and visit the website. 3.How to download APK? APK is the abbreviation of Android Package including BT Notification Android,Fendo APP Android.Can download from Geogle. BT Notificationsupports notifaction push including texts,calls, Facebook & Twitter,anti-lost,remote camera. APK Download Open the QR code device >Scan it by the scanner >Install the APK on your Android smartphone. Note 1:The QR code is global used and applied to any scanner.If there is no scanner on your phone,please download one in the app store. Note 2.It works perfectly for Android phone,but for the IOS system(Iphone):It only support answer phone,receive text,Calculator, Clock, Stopwatch, Music player,Handsfree.Not include call and text.If u want the full function,you can insert a SIM card and memory card as a standalone phone to use.3.About push messages from Facebook and Twitter,need to insert SIM,SDcard.4.Support card from Unicom, mobile‘s company.5.Two time modal can be set:12/24 timeThe password is:1122.If screen cant work,please check the watch's power firstly.If have any problems,please dont return it,just E-mail me,i will provide a solution better return,REFUND OR RESEND for free.