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Installing the CAcert.org class 3 certificate on the N73

As it takes a while to find the right information through search engines, here's how to install a 3rd-party X.509 CA certificate to the Nokia N73 (and other S60 platform, 3rd edition or later, phones):

  • You'll need a DER encoded certificate, PEM doesn't work.
  • The web server with the certificate has to return content type application/x-x509-ca-cert

Unfortunately, CAcert.org's web server currently returns text/plain for the DER-encoded class 3 certificate. The documentation from Nokia describes how to install it by transferring the cert file to the phone. I haven't tried that, though. Instead, I simply copied the DER file to my own web server, which returns the correct content type, and downloaded it from there with the phone.

New Toy

Sending it back...

I had ordered a Nokia N73 along with a renewal of my mobile phone contract. Unfortunately, what the online shop didn't say was that the phone is locked to my provider's SIM cards. It does say now, but I could swear that it wasn't mentioned when I ordered. Anyway, I'll send it back tomorrow. It is useless for me. Apparently, I need a quad band cell phone in Southern Utah / Northern Arizona and the N73 is suitable for that, but roaming doesn't work properly with my provider in that region. Thus, I need a quad band phone which works with a US SIM card. Which obviously isn't the case with a network-locked phone. Luckily, I can cancel almost any online order in Germany within 14 days after delivery.