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Device guides for

OPTUS E3131 USB Modem/Windows 7

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Checking SIM lock status for my modemStarting the modem applicationInstalling my modemUninstalling my modem

Turning use of PIN on or off

If you want to protect your SIM against unauthorised use, you need to turn on use of PIN. Once done, it needs to be keyed in every time you use your modem.