You have to be a little careful with these numbers, a lot of Opera browsers are set to spoof IE or Netscape. I currently have my N800 spoofing the iPhone's id to allow me access to the google iPhone pages (with a Greasemonkey script).
Mozilla/5.0 (N8x0 like iPhone; U; Linux like Mac OS X; ARM; en) AppleWebkit/420+ (Gecko, like KHTML)
about:config?prefname=general.useragent.override&prefvalue=Mozilla%2F5.0+%28N8x0+like+iPhone%3B+U%3B+Linux+like+Mac+OS+X%3B+ARM%3B+en%29+AppleWebKit%2F420%2B+%28Gecko%2C+like+KHTML%29
about:config?prefname=general.useragent.override&prefvalue=