Due to Western sanctions and the late arrival of Burmese language support in computers, much of the early Burmese localization was homegrown without international cooperation. The prevailing means of Burmese support is via the Zawgyi font, a font that was created as a Unicode font but was in fact only partially Unicode compliant. In the Zawgyi font, some codepoints for Burmese script were implemented as specified in Unicode, but others were not. The Unicode Consortium refers to this as "ad hoc font encodings". With the advent of mobile phones, mobile vendors such as Samsung and Huawei simply replaced the Unicode compliant system fonts with Zawgyi versions.