"First smartphone"
For fun, I put "first smartphone" into Google. It wasn't Apple's. I think a BBC editor may have temporarily said that it was.
As for Apple inventing the first multitouch smartphone, though -
http://www.bbc.co.uk/news/technology-38552241 claims, with some credibility, that Apple's engineers wanted to put a keyboard on their phone. The Blackberry phone had a keyboard. But Steve Jobs wanted a phone that you could work with your finger (without a keyboard).
One finger.
If you're only using one finger, you're not actually using multi touch?