The phrase "breakthrough communications" is correct and can be used in written English.
It is often used to refer to a breakthrough in communication technology, or a new form of communication that has the potential to revolutionize a particular field. For example: "This revolutionary new software promises to be a real breakthrough in communication technology, allowing us to send data at speeds never seen before."
"It was the world's original instant-news war, made possible by the telegraph -- the 'lightning,' they called it -- a tremendous breakthrough in communications technology".
The device was first presented at the January 2007 Macworld conference by the late Steve Jobs, who described it as a "revolutionary mobile phone and a breakthrough Internet communications device". He wasn't exaggerating.
And a breakthrough internet communications device.
And the third is a breakthrough internet communications device.
Physical layer security (PLS) is a breakthrough in communications security paradigms, since it allows to achieve secure transmissions without the need of any form of pre-shared secret within the group of legitimate users.
Jobs himself called it three products in one, "a widescreen iPod with touch controls, a revolutionary mobile phone and a breakthrough internet communications device". Less noted that day was a subtle change in how the company branded itself.
Indeed, the revolutionary evolutions that the Internet will ultimately bring into the story of life on Earth are so profound that calling the next breakthrough in communications technology a "singularity" isn't too far off base.
Soviet cavalry was used to exploit the breakthrough, sever communications between the Romanians and the Italian 8th Army, and to block any possible counterattack against the Soviet flank.
After 15 years investigating the possibility of life after death, he's working on ways of developing actual scientific tools that could herald a breakthrough in communications between the living and the dead.
Or for a more recent example, consider Steve Jobs introducing the world to the iPhone, coyly suggesting he's introducing three new products: "So, three things: a widescreen iPod with touch controls, a revolutionary mobile phone and a breakthrough Internet communications device.
