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Gemalto, a Dutch SIM card maker, at the centre of NSA-GCHQ hacking believes that the United States and the United Kingdom cyberspy agencies are behind the cyberattacks to their computers. The SIM card company however disclosed that it is not true tha billions of smart phone device keys have been compromised due to the cyber attack, BBC reported.

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The alleged hacking last week says that the spies were able to get a possible access to discreetly monitor the data and voice transmissions after hacking the company.

Gemalto has been operating in 85 countries as of today. It's big clients are AT&T, Verizon, Sprint, and T-Mobile, where the latter two have almost 400 wireless network providers all over the globe.

Gemalto started an internal investigation as soon as it heard about the report last week associating NSA and GCHQ as the perpetrators behind the 2010 and 2011 computer hacks, according to The Week.

The SIM card company is commencing the thorough investigation based on documents presented by Edward Snowden, the whistle blower .

The investigation about the cyber attack was stated in the document and the sophisticated attacks that Gemalto identified in 2010 and 2011 gave them the belief that an operation by GCHQ and NSA likely happened.

"The investigation into the intrusion methods described in the document and the sophisticated attacks that Gemalto detected in 2010 and 2011 give us reasonable grounds to believe that an operation by NSA and GCHQ probably happened," the company said.

Both the NSA and GCHQ have no comments about the bold allegations.