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Revenue comparisons often include "operating system software, other bundled software" [258] and are not appropriate for usage comparison as the Linux operating system costs nothing (including "other bundled software"), except if optionally using commercial distributions such as Red Hat Enterprise Linux (in that case, cost of software for all ...
Cost to develop for the mobile OS Free: No, Requires Apple hardware. [99] Free: Free: Free: Free Cost to publish app to official store US$25 once to register to offer on Google Play [100] US$99/year: Free: Free [101] Free: Free
The secondary device is a computer running a desktop operating system, which serves as a companion for the primary device. Desktop messaging clients on secondary devices do not function independently, as they are reliant on the mobile phone maintaining an active network connection for login authentication and syncing messages.