Nearly everyone has received a strange phone call or text message not meant for you. This usually happens because the caller has an outdated number for the person they're trying to reach. Typically, a simple "You have the wrong number" will suffice. However, if you're getting constant text messages from an unknown person, you have a right to find out who is harassing you -- and stop them.
Visit your cell phone provider and get a print out of all the text messages you've received, starting with the first strange message.
Visit www.whitepages.com or another site, such as www.whocallsme.com or www.freephonetracer.com and type in the number in the reverse directory. Print out the person's or company's information.
Visit your local police station and fill out a report, itemising the harassment you've received from this number. Submit the forms from your cell phone provider and from the website.
Some cell phone companies will require a court order to give you a print out of your text messages. Some services charge for letting you look up a number, but there are so many free services online. Some smart phones let you download an application that automatically looks up all strange phone numbers when you get a call or a text.