Leica TS03 User Manual page 174

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Hold the SIM card with the contacts facing to the instrument and the
cut edge of SIM card facing downwards.
☞
Sliding in the SIM card differently could break the SIM card
holder of the instrument.
Slide the SIM card firmly into the slot until it clicks into position.
Close the lid. Turn to lock.
To remove the SIM card, gently press on the top of the card to
release it from the slot.
Data Management