Lenovo S580 Guide De Démarrage Rapide page 5

Preparing your smartphone
You must insert the (U)SIM/SIM card provided by your carrier to use
cellular services. Set up your smartphone as shown.
Always turn off your smartphone first before you insert or remove
(U)SIM/SIM card. Insert or remove (U)SIM/SIM card with your
smartphone on may damage your SIM card or smartphone permanently.
Step 1. Open the back cover.
Step 2. Insert the (U)SIM/SIM
cards and the memory card.
Tip: Insert the (U)SIM card into
SIM1 slot and SIM card
into SIM2 slot.
Step 3. Install the battery.
a. Align the battery
connectors on the battery
with the pins in the
battery compartment.
b. Push the battery down
into place.
Step 4. Install the back cover.