One of UK's biggest mobile carrier company, Three Mobile has suffered a major cyber-security breach that has reportedly affected millions of customers.



According to the various media outlets, the hackers has hacked into the Three UK's customer upgrade database using an employee's login details.



The hacked database contains the Name, Phone Numbers, addresses, and date of birth details. However, it doesn't contain any kind of financial information.



A spokesman for Three said: "Over the last four weeks Three has seen an increasing level of attempted handset fraud. This has been visible through higher levels of burglaries of retail stores and attempts to unlawfully intercept upgrade devices.



"We’ve been working closely with the Police and relevant authorities. To date, we have confirmed approximately 400 high-value handsets have been stolen through burglaries and eight devices have been illegally obtained through the upgrade activity.



"The investigation is ongoing and we have taken a number of steps to further strengthen our controls.



"In order to commit this type of upgrade handset fraud, the perpetrators used authorized logins to Three’s upgrade system.





Three Mobile and the National Crime Agency (NCA), had admitted about the cyber-security breach. According to the reports of Telegraph, more than two-thirds of the company's nine million customers could be at risk.



The company confirmed the breach but declined to say whether customers' data was stolen or how many have been affected.



The National Crime Agency is investigating the breach and till now they have arrested three people, two for computer misuse and one for perverting the course of justice.



A spokesman for the National Crime Agency said: "On Wednesday 16 November 2016, officers from the National Crime Agency arrested a 48-year old man from Orpington, Kent and a 39-year old man from Ashton-under-Lyne, Manchester on suspicion of computer misuse offences, and a 35-year old man from Moston, Manchester on suspicion of attempting to pervert the course of justice.



“All three have since been released on bail pending further inquiries. As investigations are on-going no further information will be provided at this time”.



