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=== PDF Viewer ===For a PDF sent as an attachment to an email, the native BlackBerry OS will read it, for free. If you need to view PDF files on your Media Card you have mostly PDF viewers out there that are not free.Pay Applications:* BeamReader* Repligo* PDFtoGoFree Option:* The native email attachment PDF view will not view PDF files saved on the memory card. It also does not zoom well. It has no "read" mode so when zoomed in you may find the image to blurry if there is text to read.* Docs2Go doesn't include a PDF reader unless you register it. Register it and you'll get a PDF viewer. Yes it's free. [http://forums.crackberry.com/blackberry-curve-83xx-f52/free-pdf-viewer-155988/ source]----Show only a call history in messages by going to messages and press ALT + P - this hides all messages in the messages view except for the call history. Oddly enough this works even if "Call Logs and Lists" is configured to show NONE in the messages view. See [http://www.blackberrycool.com/2005/02/18/viewing-call-history-only-on-your-blackberry/ Viewing Call History Only] On Your Blackberry on blackberrycool.com .Show only a call history in messages by going to messages and press ALT + P - this hides all messages in the messages view except for the call history. Oddly enough this works even if "Call Logs and Lists" is configured to show NONE in the messages view. See [http://www.blackberrycool.com/2005/02/18/viewing-call-history-only-on-your-blackberry/ Viewing Call History Only On Your Blackberry] from blackberrycool.com . === Contact Recent Activity === When viewing a contact, below the contact phone numbers, you will observe an area called "Recent Activity" which will show a brief history of the last few calls or text messages sent to or received from that particular contact. There's a glitch in v6 (v6.0.0.436) which sometimes causes text conversations with other contacts to appear in an unrelated contact recent activity. No Known Resolution. === Blackberry Running Slowly === ==== Clear Out the Event Log ====From your Home Screen of icons, press and hold the ALT key and type “LGLG” (Do not press the SHIFT key at the same time) to bring up the Event Log screen as shown. Press the MENU key and select “Clear Log”. Then select “Delete” when it asks you to confirm and finally press the ESCAPE key to get back to your Home Screen. ==== Automatic Memory Cleaning ====Options icon and click on “Security Options.” Glide down and click on “Memory Cleaning” Change the “Status” to “Enabled.” Once enabled, you will see more options. I recommend leaving the first two as “Yes” and adjusting the Idle Timeout down from 5 minutes to 1 or 2 minutes. Finally, if you want, you can “Show Icon on Home Screen.” Save your changes. ==== Close Apps ====Hold the menu key find some apps in this list that you aren’t using, open them and close the app. Remember, an app is still running unless you open the app, press menu and select “close” or “exit”. Alt + Esc also shows running apps.