Nokia 3220 - SIM Services

Menu functions
62
certificate and that the certificate
really belongs to the listed owner.
Digital signature
You can make digital signatures with
your phone if your SIM card has a
security module. The signature can
be traced back to you via the private
key on the security module and the
user certificate that was used to
perform the signature. Using the
digital signature can be the same as
signing your name to a paper bill,
contract or other document.
To make a digital signature, select a
link on a page, for example, the title
of the book that you want to buy and
its price. The text to sign (possibly
including amount, date, etc.) will be
shown.
Check that the header text is Read
and that the digital signature icon
is shown.
Note: If the digital signature
icon does not appear, there
is a security breach, and you
should not enter any
personal data such as your
signing PIN.
To sign the text, read all of the text
first and then you can select Sign.
The text may not fit within a single
screen. Therefore, make sure to scroll
through and read all of the text
before signing.
Select the user certificate you want
to use. Key in the signing PIN (see
General information on page vi) and
press OK. The digital signature icon
will disappear, and the service may
display a confirmation of your
purchase.
■ SIM services
In addition to the functions available
on the phone, your SIM card may
provide additional services that you
can access in this menu which is
shown only if it is supported by your
SIM card. The name and contents of
the menu depend on the SIM card.
For availability, rates and
information on using SIM services,
contact your SIM card vendor, e.g.
network operator, service provider or
other vendor.
Depending on the operator you can
set the phone to show you the
confirmation messages sent
between your phone and the
network when you are using the SIM
services by selecting the option Yes
within the menu Confirm SIM
service actions, in Phone settings.
Note that accessing these services
may involve sending messages or
making a phone call for which you
may be charged.
9232486_3220_2_en.fm Page 62 Thursday, January 20, 2005 1:31 PM