Although Wi-Fi is widely available, it's not everywhere. The Pavilion DM4, a laptop computer sold by Hewlett-Packard, uses a subscriber identification module, or SIM card, that you can use to get online when Wi-Fi is not available. Inserting an active SIM card into the computer permits you to connect through the 3G cellular network. With access to both Wi-Fi and 3G possible on the Pavilion DM4 laptop, it's unlikely that you will ever have to worry about being unable to access the Internet.
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Turn off the Pavilion DM4 laptop.
Disconnect all peripherals from the laptop. Unplug the computer if it is connected to a power outlet.
Turn the laptop face down on a flat surface.
Slide the battery release button toward the middle of the laptop and lift the battery out of the compartment.
Insert an activated SIM card into the SIM card slot, located on the right side of the battery compartment. Push the card in until it clicks in place.
Re-install the battery by aligning its back edge to the back of the battery enclosure and pushing the forward edge down until it clicks in place.
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