SINGAPORE - The Infocomm Development Authority of Singapore (IDA) is investigating the mobile network disruption reported by telco StarHub on Wednesday morning.

In a FaceBook post at about 4.30pm, IDA said StarHub had reported to IDA about "connection issues affecting its mobile network, which caused intermitten disruption to its mobile services".

Telco StarHub said earlier this morning that its mobile voice services are down intermittently in certain areas in eastern and western Singapore.

But its mobile data services are not affected, StarHub said on its Facebook shortly after 11am.

"Dear customers, we are facing an intermittent issue with mobile voice services in certain eastern and western areas.

"Our mobile data services are not affected. We are working on restoring voice services for affected customers as quickly as possible. Thank you."

Some customers have also complained on StarHub's facebook page that they could not make or receive phone calls even though they are in the northern and central parts of Singapore.

Affected areas also include Ang Mo Kio, Woodlands, Orchard Road and Novena, according to their reports online.

The problem started as early as 9am for some customers. As at 2.40pm, the network was still not restored.