65403555

who is this?

I jus received a call frm this exact number too. Anyone know who is this? Get so many unknown calls recently. It's irritating.

i am in singapore. i got a call from a number on my mobile. indian sounding man asking for "mark". caller made references to email/all 5 min earlier (which i did not exchange with him). he apologised when i told him he got the wrong person. i tot he could be working in airport or changi area as many numbers in the area begin with 6541 or 6542.no idea who he is.

sorry, i should clarify that the number i got a call from is also 6540 3555.

I received two missed calls from this number twice today, but when I return call, I am unable to do so - it's really getting on my nerves.. I haven't any idea who it is.

Yeah, I got a missed call with 6540 3555.
I tried calling back a few times but failed to even ring. Hmm... spam?

I'm from Singapore.
I got 2 missed calls from 65403555 on a public holiday!
Called back but can't get through the line at all.

got a missed call from 65403555. when i called back, line is engaged.

Oh wow

I just got this missed call this morning.

Got a missed call twice today! when i return call, it is engaged

Singapore Airlines Customer Service