As of today, cross-play is available in Warframe on PC and consoles.
As anounced by developer Digital Extremes. This means that everyone can play Warframe with each other, regardless of the platform they play on. The option can be turned on and off in the menu.
In-game voice chat is currently not available through cross-play. In addition, cross-saves will be added at a later, yet unknown time.
Last year, Digital Extremes already announced cross-play for the free-to-play game. It was then reported that cross-play and cross-saves would be added at the same time, but that is no longer feasible. Last year, a mobile version of Warframe was also revealed, but little is known about it.
Warframe is free to play on PC, PlayStation and Xbox consoles, and Nintendo Switch.