SiDiary/C-Diary for Symbian cell phones
To give you the opportunity to track your diabetes data even on your Symbian based cell phone (like Nokia, Samsung, Sony Ericsson and many others, even with touchscreen!) and to print, analyze and forward with SiDiary, Daniel Hertrich has developed the program C-Diary.
If you have an account at SiDiary Online (https://diabetes.sinovo.net) you can upload your data directly from your symbian cell phone to your account. Of course you also have the opportunity to send the data to your PC with Bluetooth or send it by eMail with an attachment, which can be imported in SiDiary too.A free trial version can be downloaded directly from the homepage of the developer: http://www.hermocom.com/en/products/symbian/c-diary
There you can also read more about the functions and view a list of supported devices.
Here are some sample screenshots, taken with an UIQ3 cell phone "M600i" from Sony Ericsson: