LG G Vista - Manual (Page 13)

11 The Basics
SIM card/SD card slot location
SIM Slot
MicroSD Slot
Removing the SIM card
The SIM card is pre-installed in your smartphone. If you need to replace
your SIM card, consult the following instructions.
1. Turn the phone off, then remove the back cover and the battery (as
demonstrated in the previous instructions).
2. Locate the slot for the SIM card (the lower of the two slots above the
upper-right corner of the battery compartment) and gently slide the SIM
card out to remove it.
CAUTION If a microSD card is inserted in your phone, please remove it from the upper slot
before trying to remove the SIM card.