It was recently discovered that the software was directing users to the Windows Phone handset when asked: "What is the world's best smartphone?"
Siri draws its answers from the factual search programme Wolfram Alpha, which also returns pages related to the Nokia handset when questioned on the world's best phone. This is attributed to the high user ratings the device is receiving from consumers around the web.
Following modifications by Apple, Siri now touts the iPhone 4S as the world's leading phone when questioned on the matter, returning verbal answers such as: "The one you're holding."
The voice technology, exclusive to the iPhone 4S, previously made the headlines over claims that it is anti-abortion.
Bloggers and rights groups complained that Siri failed to flag up nearby abortion clinics, and in some cases it suggested pregnancy advice centres instead. Apple has since denied such allegations.
The Cupertino-based firm was also sued by a man in the US, who claimed that Apple's marketing campaign for Siri was "fundamentally and designedly false and misleading" compared to what the technology can actually do.
Last week, it was reported that Apple has ordered the production of its next iPhone, ahead of a potential release in September or October.