Rang constantly with no message

Same thing - got a call from this number and said it was disconnected when I tried calling back

Just got a call from this number answered and there was silence.

I response to fred........ who has friend in Nigeria........ I have had this person, your friend call me on two of the numbers you listed.......... I want to know more about your friend

yeh just got a call .. I said "hello?" twice and no answer .. then they cut the phone ..

I have an acquaintance travelling in Nigeria and he rings frequently.  Sometimes the number comes up as 00111111 and recently the number came up as (08) 6464 1500.  He claims to be calling from his U.K. mobile phone all the time.  I think this must be some sort of network "scam" going on in Nigeria with routing calls through other numbers.If anyone has any other info., please post here.