Ericsson R310s - Manual (Page 6)

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Inserting the SIM Card
Before you can insert the SIM card you need to remove the
back cover and the battery.
4. Open the SIM card
holder.
1. Release the back cover
by screwing the secu-
rity screws anti-clock-
wise. Remove the
cover from the phone.
2. Remove the battery by
pulling the upper rub-
ber pull-tab, as shown
in the picture.
3. Release the SIM card
holder by sliding it in
the direction of the
arrow.