Bottom Side - Asus T200 Series E-Manual

Bottom side

Micro SIM card slot (for models with LTE only)
Your ASUS Tablet comes with a built-in micro SIM card slot that
supports GSM, WCDMA, and LTE network bands.
Hinge holes
Align and insert the latch hooks into these holes to securely
attach the ASUS Tablet to the ASUS Mobile Dock.
Dock port
Connect the ASUS Mobile Dock to this port to support keyboard,
touchpad, and USB 3.0 port functions.
22 ASUS Tablet and ASUS Mobile Dock E-Manual