
Did you receive a nasty text message on your cell phone from your girlfriend? It doesn't seem like a message she would have sent. Are you sure it is really from her?
In the near future you will no doubt receive a message from your bank saying that your account is going to be suspended due to suspicious activity. In order for your account to remain active you must call your bank at the phone number included in the text message within 24 hours. Is the message really from your bank?
You should be skeptical if you receive any text message that seems either wildly out of character for the sender or requests any data about your personal finances, passwords, or identity.
You may have just been SPOOFED! Don't fall victim to spoofed text messages.
YouSpoof.info will teach you methods to detect a spoof, what you can do if you receive one and tell you how spoofers operate.

Your cell phone rings and your caller ID says the call is from "Peter Pan." Did you really just receive a very long distance call from the isle of NeverLand? More likely it's a friend with a goofy sense of humor.
Your home phone rings and this time your caller ID reads "Visa Fraud Department." Is the person claiming to be a Visa card representative verifying some larger charges on your Visa card really who they say they are? They likely will ask you for your name, Visa card number, billing address and maybe even your Social Security number and mother's maiden name. They will claim they need the data for "Security purposes" to "Verify" your identity. It is more likely a crook.
Both calls are making use of caller ID spoofing. The "Peter Pan" example shows how someone might play a joke on you. The latter case shows how a crook is attempting to get as much information as they can from you; which they will use to rob you.
YouSpoof.info will help you understand Caller ID Spoofing, how it works, who does it and how not to become a victim of a prank or theft.