For one, they’re educating employees. When employees know the risks, they act smarter. This helps limit instances where malware is unwittingly downloaded - or passwords are shared around.
Secondly, they’re upping their security measures. Most telecom organizations have teams of network security engineers working all the time. They monitor the system and keep threats at bay.
Of course, this raises another issue; the cost of cyber security. Thankfully, this is being managed thanks to the rise in talented freelance engineers.
To learn more: problems in cyber security