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Could not activate mobile data network

Respected Commentator

Could not activate mobile data network

Hi, I have sim cards both for Prepaid and Postpaid.

I usually use Postpaid one in Singapore.

I bought Prepaid one, that is Happy Roam, then used the Prepaid one in Malaysia weekend.

 

When I came back to Singapore and replaced to Prepaid one, internet is not available.

The following message is shown.

 

Could not activate mobile data network

Turn on mobile data or use Wi-Fi to access data.

 

I already tried some such as;

 

Airplane Mode On and off

Mobile Data  On and off

Main power  On and off

 

Please advise how to solve this issue.