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?

2 Answers 2


Possibly because the phone considers the browser an untrusted application.

  • 1
    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)
    – jacobq
    Mar 5, 2014 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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