Hi,

JOSAA website is optimised to run on both Mobile and smartphones. You can use that website during councelling form your smartphone. You can also enable Desktop site in your browser to view the JOSAA website on smartphones. However, it is advisable to use PC to fill choices in JOSAA councellling as there would be 100+ colleges and 500+ branches in between them, so in choice filling  it would be difficult to view all those options in smartphone as it has less screen width.

I hope this will clear your doubt.

Thanks!!!!