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My logs recently showed the following user-agent:

samsung-gt-s5620 UNTRUSTED/1.0

Why would a user-agent have untrusted in caps in its name?

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up vote 3 down vote accepted

Possibly because the phone considers the browser an untrusted application.

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This appears to be the case. According to this UNTRUSTED is "Added by MIDP whenever an application is not signed" (where MIDP = Mobile Information Device Profile, I believe) – iX3 Mar 5 '14 at 22:59

The User-Agent is a HTTP header sent by browsers. Thus, everything can be put in it. It is a decision made by the browser manufacturer.

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