(CNN) -- Apple's Steve Jobs gave quite a monologue Monday, dressing down competing makers of smartphones, tablets and software. The brunt of that was aimed at Google, which makes the Android software that powers smartphones from a range of manufacturers including Motorola, Samsung Electronics and HTC. First, Jobs expressed skepticism about how Google reports its number of Android users. This is an issue Jobs has raised in prior speeches, yet he freely addressed the point of comparison, saying Apple has activated 75,000 more iOS devices over the last 30 days compared to Google's last reported Android activation number. Jobs, who made his comments in an unusual appearance on Apple's quarterly earnings call with investors, then took issue with the geeky argument of open versus closed, which refers to how transparent a system's source code is to developers.
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Apple's Steve Jobs participated in the company's earnings call, which is unusual
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Jobs had choice words for competitors including Google, RIM, Nokia and Adobe
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Android is Apple's biggest competitors in the smartphone industry, Jobs said
"I think it's going to be a challenge for them to create a competitive platform and to convince developers to create apps for yet a third software platform, after iOS and @placeholder."