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Originally Posted by MATHA531
No you don't get double billed as long as you are using the service in a country where your sim card doesn't charge for receiving calls. It works like this...you open up an account say with callbackworld and they provide you what is best called a trigger number...it is a phone number in the United States...You ring that number the regular way i.e. with O9 and United Mobile and most of the other cheap international sim cards but not with local prepaid sims, that results in a callback...you want for the
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Why "not with local prepaid sims"? If the local sim has free incoming calls and has the credit large enough to make a short call to the US, I can see no problem about calling the US trigger number....
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Originally Posted by MATHA531
So since you are rceiving at this point, and here is the big provision, if you are in a no charge receivng country for your sim, you don't pay them a red cent (be it US or euro) and pay the rate listed from the country of origin of the sim (Liechtenstein for United Mobile, Iceland for O9, Estonia I believe for another one) to wherever you are calling.
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And of course UK in case of "Manx" international SIMs (i.e. the ones whose numbers start with +447624)
In fact, it makes sense to use callback not only in case when you have free incoming calls. Whenever the difference between the outgoing rate and the incoming rate is large enough, there's a "room" for callback. That's why one may save some money also when using SIMs with non-free incoming like Hop or Yackie. The only disadvantage is of the above that there's a "setup fee" resulting from the fact that you pay already when you listen to the voice prompts, dial the destination number and wait for the connection. Moreover, if the connection is not answered by a human being or voice mail/answering machine, you are charged (at the incoming rate) for all the time you were connected to your callback provider but infact you are charged for the unanswered call.