"Mission success! We are delighted to report we have made contact with all 40 satellites from #OneWebLaunch15," OneWeb tweeted.
According to OneWeb, with this latest launch, the company has now almost 80% of its planned low Earth orbit (LEO) constellation deployed.
In March, OneWeb suspended all future launches from the Russian-leased cosmodrome in Kazakhstan after Moscow demanded that the company provide guarantees for non-military use of the satellites and asked that the UK government sell its stake in the enterprise.
The OneWeb satellites are designed to build a space-based communications system providing broadband internet access to any location across the globe.