Symbian OS eventually became the most widely used smart mobile operating system, though notably not as popular in North America.
UIQ was another Symbian user interface mostly used by Motorola and Sony Ericsson, whereas in Japan the MOAP(S) platform was created by carrier NTT Do Co Mo.
Its objective was to publish the source code for the entire Symbian platform under the OSI- and FSF-approved Eclipse Public License (EPL).
Afterwards, different software platforms were created for Symbian, backed by different groups of mobile phone manufacturers.
The Symbian platform was officially made available as open source code in February 2010.
Nokia became the major contributor to Symbian's code, since it then possessed the development resources for both the Symbian OS core and the user interface.
However, some important components within Symbian OS were licensed from third parties, which prevented the foundation from publishing the full source under EPL immediately; instead much of the source was published under a more restrictive Symbian Foundation License (SFL) and access to the full source code was limited to member companies only, although membership was open to any organisation.
Also, the open-source Qt framework was introduced to Symbian in 2010, as the primary upgrade path to Mee Go, which was to be the next mobile operating system to replace and supplant Symbian on high-end devices; Qt was by its nature free and very convenient to develop with.