We have been advised of essential scheduled carrier maintenance to upgrade core infrastructure. The windows are as follows; Window 1 Service Impact Start Time: 2/6/2017 02:00 Service Impact End Time: 2/6/2017 04:30 Impact Time Expected: 30 minutes Throughout the duration of this window, subscribers may see disruption of up to 30 minutes to their 3G/4G data services in the following areas: Kensington, Hampstead, Paddington, Hammersmith, Westminster, Battersea Window 2 Service Impact Start Time: 8/6/2017 01:00 Service Impact End Time: 8/6/2017 03:30 Impact Time Expected: 2 hours, 30 minutes Throughout the duration of this window, subscribers may see disruption of up to 30 minutes to their 3G/4G data services in the following areas: Camden, West Berkshire, City of London, Islington, Lambeth, Southwark, Westminster If you have any questions regarding this maintenance, please don't hesitate to contact our support team on 03333 400 999.