Sony ensures that the new software works with the basic functions of the smartphone, such as making calls, sending and receiving SMS, and surfing the Internet. This is followed by ensuring that the new operating system version works with the user interface, custom graphics, and features from Sony. At this point, the software is streamed inside Sony to be tested inside and outside the company. Comments from external testers allow Sony to make changes as needed.
The second phase covers the certification and approval process. Bluetooth and Wi-Fi certification is obtained from alliances and appropriate groups. Even after the release of the update, Sony continues to monitor user feedback in support forums and social networks. And that's why the owners of the half-dozen Xperia handsets mentioned above will have to wait another three months to run the Android 9.0 Pie on their Sony branded phones.