In reply to Steph Roberts:
Hi Steph
Sorry about the delay.
The climbing on Symi is in St. George's Bay which you would need to access by taxi boat.
When we were last on the island (2005) there were 10 sport routes, one on the left side of the bay (6a) and the rest at the right end with the first at the back of the obvious gulley. Grades range from 5c to 6b+.
There is a lot of potential for more routes. The cliffs are 300m high.
Regards
Andy