This Kids Smart Watch Blue for 4-12 years old children has features and functions as 14 Intelligent Games, Music MP3 Player, Camera, Calculator, Alarm Clock, Stopwatch, Timer, Album, Calendar, Customized Wall Paper, Time Format 12/24hour, Silent Mode, also the Phone Call and SOS features as long as your area is covered with 2G network and you have an availalbe SpeedTalk sim card for smart watches for kids. How to make Phone Calls with this smart watches for both boys and girls? Step 1: Check whether 2G network is covered in your area or not, if yes move to next step. Step 2: If 2G available, please purchase a SpeedTalk sim card on Amazon or market. Recommend $5/month plan. Step 3: Please turn off the kids smart watches. Insert the sim card correctly. Then turn on the kids watch and wait for 10 seconds to search & receive signal. Done and try to make phone calls. We suggest operate outside your house for stronger signal. PS: No need to set any APN. How to download music to this smartwatch for children? Use a charging cord and connect your PC. Find the folder named “My Music” then start to store your songs to the watch. PS: There is already a built-in memory chip inside the child smart watch, therefore no need of external SD card. Specification of Kids Smart Watches Material: Plastic, Silicone Strap Length: 230mm/9.4” Strap Width: 20mm/0.79" Display: 1.54 inch touch screen. Package includes: - 1 x Kid Smart Watch - 1 x USB Cable (No Charger) Any question please contact us.