How do you sort out facebook for a sony ericsson phone?

I have a sony ericsson c903. I just want know how come when some of my friends update their status or upload pictures it says done via sony ericsson. However when i update my status or upload pictures it says done via mobile web. I would really appreciate it is if someone could help me. Thanks.|||Go to "Account Settings" and then, "Mobiles". You can see the list of phones, like Blackberry.