The Series 30, often shortened as S30, software platform is an application user interface created by Nokia and currently developed by Microsoft Mobile for its Nokia-branded mobile devices. S30 phones are capable of running Java apps. Despite the naming similarity, Series 30+ is an entirely unrelated platform, licensed from MediaTek and used on later Nokia-branded feature phones. Unlike S30, S30+ does not support Java apps.
Older platforms used by Nokia appear to have been discontinued.