Do Native Mobile Plugins Require Pro?

A quick question about iOS and Android plugins: In the documentation here it states that...

On the desktop platforms, plugins are a pro-only feature.

Does t$$anonymous$$s mean that if if I'm only targeting iOS and Android (not Windows, OSX, etc.), and I want to make use of a native C++ plugin, I would be okay with just Unity Free and the standard iOS and Android targets? In other words, a total cost of $800 ($400 for iOS and $400 for Android), and not $4500 ($1500 for Unity Pro, $1500 for iOS Pro, and $1500 for Android Pro)? The difference would certainly blow my budget ;)