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Device guides for

OPTUS E3131 USB Modem/Lion

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Updating the modem applicationRecharging data for my modemInserting a SIM into my modemInserting a memory card into my modem

Copying contacts between my SIM and the modem application

If you change SIM or modem, you can copy your contacts between your SIM and the modem application (Optus Mobile Broadband). as it saves you from keying in all the information again.