if you have GT series, just push the sim card you will feel a click , GT use biggest standard sim card , not micro , not nano size
our all-in-one sim card has all three sizes


if you use TK series, please slid the sim card holder to take it out



for GT , when you insert the sim card, it will light up the blue led
here is GT how to insert the sim card


for TK, press the power on button for 3 seconds , the green led will light up