How do I update my account using a text message (SMS)?

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How do I update my account using a text message (SMS)?: If you’ve set up Facebook texts, you can send a text (SMS) to 32665 (FBOOK) to update your status and get notifications without using data. Please keep in mind that standard messaging rates apply.

How do I set up Facebook texts?

If your mobile carrier supports Facebook texts, you can set up Facebook Texts from your settings:
Click at the top right of any Facebook page and select Settings.
Click Mobile.
If you haven't added your mobile phone number to your account, click Add a Phone and follow the steps. If you've already added a mobile phone number to your account, click Activate Text Messaging.

Select your country and carrier, then click Next.
Using your phone, text the letter "F" to 32665 (FBOOK) to get your confirmation code.
Enter your code, then click Next.

Once you set up Facebook texts, you can receive texts (SMS) from Facebook and update Facebook by sending a text. Please keep in mind that your country or carrier may use a different number from 32665. Check the list below to find the right number for you.

Shared PhonesIf you share a mobile phone number with another person, you can choose to receive Facebook texts (SMS) for one or both of the accounts. To stop receiving texts (SMS) for one of the accounts, reply STOP to the text message sent to that person. You can reply ON to turn messaging back on for that account.

To stop receiving text messages for all accounts on a mobile phone number, reply STOP to one of the codes listed below.

Note: Facebook doesn't charge you for using Facebook texts. However, your mobile provider's standard rates for sending and receiving text messages (SMS) still apply.

Source: Learn Facebook Basics

When you want to...	Send a text (SMS) with...
Update your status	Your status (ex: What a great weekend)
Get a one time password for Facebook	OTP
Start getting text notifications	START
Stop getting text notifications	STOP
Get help	HELP

Note: You can choose what you want to get notified about from your settings. You may need touse a different code from 32655 (FBOOK), depending on your country and carrier.