This is the fifth mobile call within a few days starting with 0411......

They ring then hang up, even if I answer (although I do not say anything now) the just hang up. They have not rang back.

I am putting to down to SPAM calls.

Other numbers I have received are from:
0411 593 302
0411 593 760
0411 508 438
0411 539 470
0411 535 937