U Mobile announced it would do system upgrades and maintenance works this month and August.
According to the telco, customers might experience service interruptions during the scheduled dates.
However, most users might not be affected as the works would take place from midnight until early morning between 6am to 6.30am.
The first upgrade will happen on July 18, along with other sessions on Aug 3, 8 and 9 respectively.
All services are expected to be fully restored by Aug 10 according to U Mobile.
For more information, users can call U Mobile’s customer service hotline at +6018-388 1318.