Can anyone tell me a free PDF reader for Nokia 7210 Supernova? .jar applications work on my phone.
Have you tried Adobe Reader LE?
I agree with Stivinn, it will be hard to read much of anything on your phone but it is worth a shot!
Symbian 40 mobile phones like the Supernova 7210 have 2 MB RAM, which is insufficient to view most PDF files.
However, small PDF files (~500kB) can be read on your mobile device using certain java applictions (i.e. PDF readers).
I recommend going over to http://www.getjar.com or http://www.mobile9.com (m.getjar.com or m.mobile9.com from your mobile phone) and do a quick search for 'PDF readers' for your specific handset.
I currently use 'Mobile PDF' vendored by 'Zesium' on my Nokia 3610 fold (another S40 phone with similar specs as your 7210), which i downloaded from m.mobile9.com. It opens PDF files that are generally smaller than 1 MB. Do not expect PDF files larger than 1 MB to be viewable, though.