Audiovox GSM/GPRS Compact Flash Card RTM-8000 Owner's Manual page 47

If connection is established successfully, Connected dialogue box will
appear. Now you are ready to surf the Internet using Pocket Internet
Explorer or other applications.
Note: To disconnect from the Internet again, tap the two-arrow symbol on
the top bar of your PDA screen. When the dialog box appears, tap End.
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Using the RTM-8000