Precautions:

Only support 2G GSM micro sim card with data and voice plan. Not support CDMA sim card.GSM quad- band: 850/900/1800/1900MHz.Use a card that supports 2G networks and does not support 4G.

SIM insert way:

Step 1:screw out the 2 screws,take off the cover
Step 2:insert SIM card(keep the chip upward),push it inward
Step 3:insert the cover
Step 4：lock the cover by screw to protect from water
Step 5:open the watch

Specification:

Cpu model:MT6261
communication system:GSM
frequency band:850Mhz/900Mhz/1800Mhz/1900Mhz
Screen:1.44 inch  camera:300000 pixels
Cover material:plastic   internal memory:32MB    strap material:dow corning food grade silicone
Watch size:1.44*1.25*0.44 inch  watch weight:0.1 LB

Packing list:
Cell phone watch(with battery)*1

USB cable*1

Screwdriver*1

Operation instruction*1

Top clamping needle*1

Two spare screws*1

Product Features

• ❤❥【Double Positioning】2019 Latest Children’S GPS Waterproof Watch.GPS Positioning Accuracy Of 10 To 30 Feet, Lbs Accuracy Of 300 To 1600 Feet.Download The App “Setracker2”, Buy A Sim Card That Supports 2G,Speedtalk Or T-Mobile Card, 850Mhz/900Mhz/1800Mhz/1900Mhz.Tailored For Children Ages 3-15.
• ❤❥【Powerful Features】HD Camera, Weather Forecast, Footprints, Remote Shutdown, Alarm,Clock,Security Zone, SOS Emergency Alarm, Autonomous Dialing, Low Electricity Alarm, Photo Album,Intercom.6 Kinds Of Puzzle Games,Including Mole Buildin,God Of Weath,Ninja Running,Math Game,Brave Monkey.
• ❤❥【Dual Control Mode】★Class Mode★The Anti-Interference Time Can Be Set On The Mobile App，Prevent The Child From Playing The Watch In Class.★Dialing★The Dialing Function Can Be Set By The Switch In The Mobile Phone App – The Dialing Function Is Turned On Or Off.Protect Your Child’s Safety.
• ❤❥【Micro Chat】The Volume Of The Phone Is Very Loud, And The Noisy Places Can Be Heard Clearly.When The Record Staring,App Begin To Record Then Sent To The Watch,The Maximum Recording Time Is 15 Seconds,Shot Press The (Power On)Key To Play The Voice At The Watch.
• ❤❥【Quality And Service】IPX 68 Water Rating,100%Waterproof,There Is No Problem With Swimming.Support Free Return And Exchange, 100% Satisfactory After-Sales Service, If You Encounter Any Problems After Using, Please Feel Free To Contact Us. If You Are Looking For A Gift For Your Child, Don’t Hesitate, You Won’t Regret It.