O2 has apologized for a technical problem which caused users' phone numbers to be disclosed when using its mobile data. The Information Commissioner's Office had said that it would speak to O2 to better understand what has happened. O2 said the problem was a temporary issue which arose during routine maintenance. O2 said that the limited sharing of numbers was standard industry practice.
In a statement Vodafone said it pursued a similar policy adding that it only shared numbers with approved Vodafone UK partners who were subject to security checks to ensure they conform to our stringent requirements around protecting our customers' privacy. The company said this was needed to manage age verification, premium content billing, such as for downloads, and O2's own services.