3. Replace the memory module cover.4. Insert the battery into the battery bay, or connect the AC adapter to your computer and an electrical outlet.5. Turn on the computer.As the computer boots, it detects the additional memory and automatically updates the system configuration information.To confirm the amount of memory installed in the computer, click Start ® Help and Support® Dell System Information.Subscriber Identity ModuleSubscriber Identity Modules (SIM) identify users uniquely through an International Mobile Subscriber Identity.1. Follow the procedures in Before You Begin.2. In the battery bay, slide the SIM into the compartment with the cut-off corner of the card facing away from the compartment.Wireless Mini Cards1 tab 2 notchNOTICE: If the cover is difficult to close, remove the module and reinstall it. Forcing the cover to close may damage your computer.CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.NOTE: Only Cingular and Vodafone need a SIM. Verizon, Sprint, and Telus do not use SIMs.1 battery bay 2 SIMCAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.NOTICE: To help prevent damage to the system board, you must remove the battery from the battery bay before you begin working inside thecomputer.