Sony Ericsson Xperia™ ion HSPA(LT28H) - Manual (Page 134)

Developer
options
Set options for application development. For example, you can
show CPU usage on the phone display. You can also set the
phone to enter debug mode when USB connections are active.
About phone View information about your phone, such as the model number,
firmware version, phone number and signal. You can also update
your software to the latest version.
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