Magic Leap, the maker of augmented-reality goggles, has already raised $2.3 billion, an extraordinary amount for a start-up. Now it has secured yet another investment — and could raise still more cash.

The company said Friday that it had garnered $280 million from NTT DoCoMo, Japan’s biggest cellphone service provider, as part of a new partnership between them. It will also reopen its most recent fund-raising round to potentially accept even more cash from new and existing investors.

It is the latest move by Magic Leap to build its vision of making its flavor of augmented reality — where people see computer-generated images in the real world, thanks to a special headset — ubiquitous. (The company calls its version of the technology “spatial computing.”)

That pitch has enabled the company to become one of the best-funded start-ups around. But it also raises questions about whether Magic Leap, which began shipping its headset last year for $2,300, can make good on its promise, especially as it faces competition from technology giants like Microsoft.