Files named "call" and "video call" with phone and camera icons were dug up in the app's Android application packages (APKs), which can often reveal components for unreleased functions that are present but not yet live.
The company has been improving its private messaging capabilities at a steady rate, most recently adding live video support. Instagram has also been testing a new standalone app called "Direct" that will be solely focused on direct messaging friends and family members.
The addition of voice and video calling would put Instagram in competition with Snapchat on yet another front. Apart from Stories, Instagram has been working hard to outdo Snapchat with other new features like replay privacy controls, which the latter doesn't currently offer.