It seemed like Nokia had forgotten to add an option “Insert number” in the SMS options menu but in fact the best way to include a phone number from your address book is to press the address book button whilst compiling your sms and select the number that you would like to copy and paste. Go to USE NUMBER in the OPTIONS and select COPY. Exit out of the address book and press the COPY/PASTE button on the right of the phone and select PASTE. Done. Nokia developers don’t seem to be as dumb as we thought they were.