I have always wished for my computer to be as easy to use as my telephone...
I have always wished for my computer to be as easy to use as my telephone. My wish has come true because I can no longer figure out how to use my telephone. (Bjarne Stroustrup)
Hey look - a joke that is referenced!
This joke is ironic, because the person's wish came true in an unexpected way. The person really was wishing that their computer would be easier to use, but with the exact wording of the wish taken into account, the wish was able to be fulfilled by making their phone harder to use.
The unexpected subversion of the wish is where the humor is found in this joke.