This is the info which CIC mentions on their website http://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=772&top=4The UCI number is on the visa, just do a google research with images and you will figure it out...
It doesnt say it can be found on Visitor Visa?
Where can I find my client ID/UCI?
This eight or ten digit number appears on all documents you get from us. It looks like this: 0000-0000 or 00-0000-0000.
If you have sent us an application before
Look for this number on:
- letters we sent you
- your immigration document such as a PR card, study or work permit
- you can leave the field for UCI (Client ID) blank