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Doesn't matter what the prefix is.Now we have some “6” and “3” prefix using VOIP. I am thinking how do we know if it is really fixed line or using VOIP? U can have a “6” and “3” series ringing on your mobile phone and this consider fixed line or mobile line?
IMDA has defined mobile numbers to be leading with 8 or 9 in the National Numbering Plan. Everything else will be billed. So if you call via a 3 series VoIP number, even if it's a mobile app on the phone, it's still not calling a mobile number. Just call the person directly on their mobile number or use an app if you don't mind the inferior call quality.
https://www.imda.gov.sg/regulations-and-licensing-listing/numbering
