SINGAPORE - A school bus driver discovered his phone did not have mobile service when he tried to make a phone call on Tuesday morning.
A frustrated Mr Manogaran, 58, was among M1 subscribers who suffered a six-hour outage after a glitch in the mobile network.
He said: "It disrupted my work as I was unable to make calls to parents or other bus drivers."
An M1 spokesman said some customers began experiencing intermittent voice and SMS service access from about 7am. But its mobile data services were not affected and its mobile services resumed at 12.15pm.
Caused by a glitch
The Infocomm Development Authority of Singapore (IDA) went on its Facebook page at about 11.50am to urge M1 to restore services as soon as possible to minimise inconvenience to its customers.
M1 chief executive Karen Kooi said preliminary investigations suggested that a call processing software issue had unexpectedly prevented its customers' devices from registering on the mobile network.
There will be a full investigation to determine the cause of the incident.
"We appreciate our customers' understanding, patience and support, and we would like to offer our customers one day of free local mobile calls, local SMS and MMS this Sunday as a goodwill gesture," Ms Kooi added.
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