U Mobile will be conducting a regular maintenance and upgrade of its network which will affect some customers during this period. The telco released a statement 5 days ago and have again posted this message on its social site, this will be on 18th July, 3rd August and 8th or 9th August. To all customers do take note as these are common practice to ensure uninterrupted service in the future.

Copy of the notice.

Dear valued customers, we would like to inform you that you may experience service interruptions on 18 July, 3 August, 8 August and/or 9 August during the off-peak hours of midnight to 6.30am. This is due to scheduled system upgrade and maintenance efforts. We apologise for any inconvenience caused. For more info, please contact Customer Service at 018-388 1318