AT&T is a US-based telecoms company, and the second largest provider of mobile services and the largest provider of fixed telephone services in the US.
AT&T Cybersecurity develops commercial and open source services to manage cyber attacks, including the Open Threat Exchange, the largest crowd-sourced computer-security platform. AT&T Cybersecurity delivers the ability to help safeguard digital assets, act with confidence to detect cyber threats to mitigate business impact, and drive efficiency into cybersecurity operations.