Lenovo A7 30 Tablet - Manual (Page 4)

Installing the SIM card & microSD card
Do not insert or remove the SIM card while your tablet is turned on.
Doing so may permanently damage your SIM card or tablet.
You can use cellular services by inserting the SIM card provided by your
carrier services. Install the SIM card and microSD as shown.
Step 1. Open the microSD card slot cover as shown.
Step 2. Place the SIM card into the SIM card slot and the microSD card into
the microSD card slot.
Step 3. Carefully replace the slot cover.
SIM SIM
SIM
SIM
Reset