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Where you should be: Account settings > Mobile tab.
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Facebook Mobile opens up security features which can be very useful, especially for log in notifications and a two-factor system. If you have not already added your phone, you can do here -- but on the safe side.
1. Click Add a phone.
Because of Facebook's security system, where your mobile can be used to access your profile and account, you will need to enter your password in.
2. Enter your password and hit Confirm.
Facebook will shortly be sending you a confirmation text message to verify your phone. First, it needs a few details from you.
3. Choose the country your phone number is registered to. For +1 numbers, select the United States. For +44 numbers, select the United Kingdom, for example.
4. Select your mobile network from the list. If it does not appear, you will not be able to use Facebook Mobile.