No it is not sarcasm.

My mobile phone is a Nokia 6310i and is nearly 6 years old. It is my understanding that it is obsolete. However, if I search Nokia web sites, I cannot find any statement of it being discontinued. My suspicion is that Nokia simply does not make such announcements.

Is my assumption incorrect?

If so, perhaps you would be kind enough to direct me to the Nokia resource where I might find official announcements of discontinued models.