Someone could hack into your voicemail, even steal your number without you knowing!  
 
Spoofcard.com is one of many websites that claims to offer privacy.  But experts say, in the wrong hands, the technology can be very dangerous.  Spoofcard let's you enter any phone number to change what people see on their caller ID when you call.  Essentially, a caller can become anonymous.  Spoofcard representatives insist the majority of users rely on their service for safety reasons, like doctors who make calls from home and don't want their number known. 
 
That was not the case for one woman we spoke to.  We'll call her Sam, she wants to remain anonymous after receiving dozens of terrorizing phone calls at work. 
 
"They're just claiming that they're going to come to my house, they listed my home address, saying that I'm going to pay for this.  I was scared to death.  I think I burst into tears thinking what had I done."  said Sam.  Sam also didn't know who was out to get her because police realized she was being spoofed.  A caller using spoof software to disguise their number to make harassing and threatening phone calls.
 
"It went from being just a silly prank phone call to really terrifying me," said Sam.

Experts say the law has not caught up with cyber services.  "The terms of agreement says that you need to use it in a legal way.  So the technology is legal but the way it can be used is illegal"  said Chris Herrmann a professor at John Jay College of Criminal Justice.   There is legislation being considered, The Truth in Caller ID Act, that would prohibit fraud and harassment but it won't make spoofing software illegal. 
 
A spoofcard spokesman says their technology is no different than others on the market, even the old fashioned ones like using a pay phone to remain anonymous.  They are also encouraging mobile carriers to protect voicemail boxes.