O2 privacy failure: is your mobile number being shared when browsing online?

An alarming story has emerged over the last 24 hours for mobile phone customers on the O2 network (potentially including MVNOs GiffGaff and Tesco Mobile that piggy back on O2):

Your mobile phone number may be disclosed to internet servers when browsing websites from your phone.

Check out this page to test this for yourself (make sure you turn off WiFi so that you’re definitely connected via your provider’s network).  It’s not believed to impact Vodafone, Orange, T-mobile or 3 customers, and may be dependent on which APN you use for your data connection (e.g. pre-pay vs. contract customers).

Expect more news on the story from Charles Arthur at the Guardian and via Lewis Peckover’s Twitter feed.

[Update at 3pm UK time: story now covered by BBC, Guardian, Wired etc. – you heard it here first!]

[Update 2 at 7pm UK time: O2 apology and FAQ via their blog and Information Commissioner’s Office pursuing alleged data breach]

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