In the future, Chrome OS users may unlock their PCs just by having their smartphone nearby.
Regulatory filings reveal details of secret tests by Google, a step beyond last year's trial in California.
A phone with swappable parts is certainly a cool idea, but it's all the underlying technology associated with the project that has developers excited.
This year at Google I/O, we can probably expect to hear a lot about making Google products look and work better.
But the company's bread-and-butter remains ads as it brought in $15.42 billion in revenue during the first three months of 2014, up 19 percent from the year-ago quarter.
Participating businesses can now distribute ads across the Web, which look like Google+ posts.
But first it needs developers to make what consumers want.
The system will be based around a basic $50 skeleton with customizable modules
The company clarifies that emails are automatically scanned to provide users with tailored advertising and better search results
NTT DoCoMo, Modu and Microsoft have all showed modular concept phones, but Ara might be the most advanced yet.