No evidence of NSA and GCHQ Sim card hack, says allegedly compromised firm

Gemalto, the world's largest Sim card manufacturer, denies claims intelligence services hacked into its servers and stole the keys to billions of mobile phones

The firm allegedly hacked by the NSA and GCHQ has stated that it cannot find any evidence that the US and UK security services breached and stole the encryption keys billions of Sim cards.

The alleged hack was revealed by documents from the NSA files provided by Edward Snowden, which detailed attacks on Gemalto - the world's largest Sim card manufacturer - which allegedly saw them steal encryption keys that allowed them to secretly monitor voice calls and data from billions of mobile phones around the world.

Related: Mobile phones hacked: can the NSA and GCHQ listen to all our phone calls?