OPhone, or OMS (Open Mobile System), is a mobile operating system running on the Linux kernel. It is based on technologies initially developed by Android Inc., a firm later purchased by Google, and work done by the Open Handset Alliance.[4] The OPhone OS has appeared only on China Mobile phones, and the software was developed for China Mobile by software firm Borqs.[5] A modified version of OMS has appeared on other carriers as Android+, also developed and maintained by Borqs.[6] Android has been modified for local Chinese markets by China Mobile's OPhone Software Developers Network.[7][8]