Yes, you have complete access to all of your other applications (except those which use the serial library during a call, such as another wireless application). Therefore, you can view your calendar, enter an appointment, write a note, create a to do item, or enter contact information in your address book—all while talking on the phone. Of course, this feature is most useful when using the included headset or in speakerphone mode. To return to the Phone application, simply press the Phone button on your Treo communicator—and you'll be back in the Phone application.

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