I am received a call on my mobile (in Australia) from this number too but didn't answer as it looked suspicious. I heard on the radio that dodgy high charged calls to your phone are coming from numbers that start with +20 so I'm definitely staying away from it either way.
I received a call from this number and 5pm I answer with my name then they hung up ... I will wait to see what marketing company calls me next and then post it here ....
I receive calls from this number every couple of days (to my mobile in Aust), I never answer them. It is really annoying. I don't understand why, if they just hang up anyway.
I missed a number of calls from this number (+1 206 278-9554) over the last couple of months and finally answered it today and it was a sales rep from www.BigRoo.com.au
They just wanted to check my current free listing account details and try and sell me an upgrade.