I recieved this unsolicited SMS this morning at 9

Eng-Huat | 04 May 2018

Wangiri Scam
I recieved this unsolicited SMS this morning at 9.14am from 79900:

"You are subscribed to lbsg/Weekly. Visit http://sg.thelogicalbase.com/unsubscribe.php. U’ll be charged S$10.70 w/GST by 05/05/18. To Opt Out send STOP lbsg to 79900. Help 63387005"

Looks like a scam and I did not respond to it. Suspect I will be charged if I reply to the message. Called M1 instead to activate the PRS (Premium Rate Services) Barring for my mobile phone.