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					Originally Posted by Phil_in_CA  Thanks for the information.
 So, let me see if I understand.  If I got an unlocked GSM phone, Icelandic international SIM with callback, my in-laws would just call an 800 number to get to me.  I would use a callback number to call them, right?
 
 I almost understand callback, but am not sure if I have it right.  Could you go over it, for a thick-headed ludite?
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 Normal callback (Icelandic SIM): dial destination number; you will get a message on the phone such as call not allowed; a few second later your phone will ring and you answer it; the destination number you dial first will ring; you should be charged only if the call connects -- that is you let it ring until you connect.
Callback World double callback: EVERYTHING above PLUS (or but you are dialing your CBW number, not the final destination number) so when you get to the last point where you answer the [first] callback, you let it ring once and hang up again.  CBW will call your phone back.  Answer and at that point you dial the TRUE destination number.
Stan