http://www.wired.com/news/privacy/0,...tml?tw=rss.TOP
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Wire-transfer services like Western Union require customers to call from their home phone when they want to transfer money in an effort to deter fraud -- a barrier easily sidestepped by any identity thief using a caller-ID spoofing service. Fraud rings can now transfer money directly out of stolen credit-card accounts, rather than buying merchandise and reselling it, he said.
Western Union spokeswoman Danielle Periera said the company has no other way to verify that transfer requests are valid. "We try hard to stay one step ahead of them and recognize that scam artists are sophisticated and often change their schemes," she said.
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or you can just use it to freak the shit out of your friends, or change there cell phone message
try the free spoofing demo to your own phone here
http://www.covertcall.com