Ich kenne dieses spezielle Modell nicht, aber habe folgendes in Netz gefunden:
Internet security and certificates
Your phone supports secure browsing.
Certain Internet services, such as
banking, require certificates in your
phone. Your phone may already
contain certificates when you buy it
or you can download new certificates.
To check certificates in your phone
From standby select Menu } Settings
} the General tab } Security } Certificates.
Es klingt also so als muesste man ein Security certificate downloaden und loaden (womoeglich via PC wenn's connected ist?)