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All KX-TG1100 phones are essentially the same, I have found that manual for you here. Please make sure you rate my answer 4 thumbs up! Thanks so much for understanding, it would be a huge help to me. Here is the manual:
http://www.user-service-manuals.com/Panasonic2/KX.shtml or http://safemanuals.com/user-guide-instructions-owner-manual/PANASONIC/KXTG7341E-_E or http://www.devicemanuals.com/guide/Telephone%20and%20Fax/Panasonic/Panasonic-KX-TD816E-User-Manual-==TVRNNE56Z3c=.html
check page 18 from your user guide (or at "http://phone.manualsonline.com/mdownloads/2a9697eb-f1f9-a434-457a-98ab6de1d9cc.pdf" if you don't have the book), your security code may not be set. good luck!