User Guide for Nokia E51: 

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Chapter Summary: To see how much memory is currently in use, how much free memory remains, and how much memory is consumed by each data type, select Menu > Options > Memory details > Phone memory or Memory card...After you install applications to a compatible memory card, installation files (.sis, .sisx) remain in the device memory...The files may use large amounts of memory and... prevent you from storing other files...To maintain sufficient memory, use Nokia PC Suite to back up installation files to a compatible PC, then use the file manager to remove the installation files from the device memory...If the .sis file is a message attachment, delete the message from the Messaging inbox......

User Guide for Nokia E51 Users also looked at: Page 37 - Voice commands Select Menu > Tools > Voice comm...Use voice commands to make phone calls and launch applications, profiles, or other functions on the device...... The device creates a voice tag for the entries in Contacts and for the functions designated in the Voice commands application...When a voice command is spoken, the device compares the spoken words to the voice tag in the device...Voice commands are not dependent on a speaker’s voice; however, the voice recognition in the device adapts to the main user’s voice to recognise voice commands better...... Page 16 - Lock the keys To lock the keys manually in the standby mode, press the left selection key and... Page 48 - Messaging Verify that the network supports the messaging features you want to use and that they are activated on your SIM card...... Select Menu > Messaging...You can also receive web service messages, cell broadcast messages, and special messages containing data, and send service commands...Before sending or receiving messages, you may need to do the following... Define the multimedia message settings on the device...58...If not, you may need to define the settings manually; or contact your service provider to configure the settings...... Define the text message settings on the device...See "Text message settings", p...58...... Page 67 - Printing options To set an alarm, select Options > Set alarm...When an alarm is active, is displayed...... Print to file — Select to print to a file and determine the location for the file......