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In most areas, the number for Facebook Texts is 32665 (FBOOK). Other locales might have a different number so check Facebook's list at https://www.facebook.com/help/130694300342171 to make sure you've got the right one. Facebook Texts will not work in countries where Facebook use is restricted. If you don't see your phone provider or country and are confident that Facebook is not restricted in your area, use the default number (32665). You'll need a computer with Internet access to set up Facebook Texts. Click the down-arrow in the top right corner of the screen and select "Settings" from the menu. Click "Mobile" from the menu on the left side of the Settings screen. If you've already provided your phone number to Facebook, it will be listed under "Your Phones." If it's not yet listed, click "Add a phone." Select your country and phone service provider and then click "Next." If you don't have free unlimited text messaging on your phone plan, Facebook Texts will count against the amount that comes with your plan. Standard message rates apply. You can edit, modify or remove your mobile phone number at any time. Click the "Verify" link next to your phone number. Facebook will now text you a confirmation code. Type that code into the Facebook box that reads "Enter confirmation code," then click "Confirm." If you didn't receive a code, click the link that says "Resend Code." Also, double-check that you entered the correct phone number. If you got the code but entering it returns a message that says "Facebook texts not activated," try texting Facebook. Compose a new text message to 32665 (or the Facebook Texts number specific to your area). Type the letter F as the message (capital F, no spaces) then tap Send. You should receive a text message confirmation that says "Confirmed!" Once you're verified, a message will pop up in Facebook asking if you want to "turn on text notifications." If you check the box, all of your Facebook notifications will be send to you via text message (this could get expensive). You'll also see an option to change the privacy settings for your phone number. Choose to share it with friends, certain friends, or keep it private, then click "Save Settings."

Summary:
Find the Facebook Texts phone number for your location. Log in to Facebook from your computer. Open your Facebook settings. View your mobile settings. Add the phone number you use for sending texts. Verify your phone number. Change or confirm your phone number settings.