As with wire transfers , though, money orders can be dangerous and run the risk of fraud and scams. Be extremely careful if you have received a money order. What’s the amount of money on the order? Does any of the information look as if it was written over previously written and erased information? Verify the order if you feel you need to. The U.S. Postal Service has a verification phone number for their money orders at 1-866-459-7822. Western Union’s customer support number is 1-800-999-9660, while MoneyGram’s is 1-800-MoneyGram.