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A SIM enables you to use mobile network services such as voice calls, text messaging and mobile data.
Turn the back of your phone towards you. Take hold of the back cover and remove it.
Take hold of the bottom of the battery and remove it.
Place your SIM as illustrated next to the SIM holder.
Slide your SIM into the SIM holder.
Place the battery in your phone (top first), matching the battery contacts with the phone contacts, and press the battery into place.
Place the back cover on your phone and press it into place.