Perhaps you've made the mistake of giving your phone number to an annoying persona person who insists on sending multiple SMS text messages to you on a regular basis, such as joke texts or forwards. If so, you know how valuable a text-blocking feature is for a cell phone. Not all phones have this ability, but on most, you can prevent text messaging from selected contacts.
Log into your cell phone account online and look for "Messaging Preferences" or a similar option. Some providers, including AT&T, T-Mobile, Alltel, Verizon and Sprint, now allow you to adjust your settings to block certain contacts. You may have to pay an additional monthly fee and register for this service. You'll probably have a limit for the number of contacts you can add to this list.
Save the phone number to your contact list. You can name it "Blocked." Then edit the contact and scroll to "Messages" or "Text" options. Change the volume to "silent" and turn any LED light and vibration settings off. This will allow you stop being notified when you get a message from this person.
Call your cell phone provider and ask the representative to block certain phone numbers from texting you. Some providers will gladly accommodate this request because they do not want you to remove text messaging completely because of annoyances from one person.
Report all cell phone spammers to your cell phone company. Take note of the phone number that sent a text to you and the product being sold so you can make a complete report. This may not be an instant fix, but over time, the spam may stop because of your complaint. Ask the provider to credit your account for any unwanted spam messages.
If you're getting unwanted text messages regularly and from many numbers, you may just want to change your number or shut off your text messaging feature completely. In the future, be careful about entering your cell phone number into websites, which are often where spammers get the numbers.