Q: Given a travel related situation, and given a specific question about the situation, summarize the question into a title
If you look at GoSim's rates (or the rates of other international sim cards), you can see that it has both a US and a global number. What is a global number? Is it the number you dial internationally to call the US number? Then why are the fees higher for receiving a call?

If it is a separate prefix for these numbers, why can't I find any information about these numbers in Wikipedia's list of country codes?

A:
What is a global number?