Most wireless service network providers issue a SIM, or Subscriber Identity Module, card whenever you get a new phone or start a new contract. The SIM card stores information about your phone, your account and other important data. You cannot make or receive calls without the SIM card in place if your network provider requires one. The Sony Ericsson W850i stores the SIM card safely beneath the battery, reducing any possible chance of loss.
Hold your phone with the top of the phone facing you and the lens of the camera facing up. Slide the battery cover toward the bottom of the phone to remove it.
Remove the battery from the compartment, lifting it from the end opposite the camera.
Insert the SIM card into the holder inside the battery compartment. Hold the SIM card with the label facing up and slide the contacts in first so the SIM card slides in properly.
Insert the battery -- contacts first -- with the label facing up. Press the bottom end of the battery into place so that it is secure. Slide the back cover back into place on the phone until it clicks.
- Save your contacts to the SIM card and you can move it to a new phone if you replace your current one.
- If you lose or damage your SIM card, your phone will be unable to communicate with the subscriber network.
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