Someone I know has requested facebook to allow login because his IP was changed and facebook was asking to enter a security code before the person can login but never send the security code to mobile. Do you have any idea how long does facebook might take to resolve this issue? Has this happened with you also? Please let me know if you have any experience with this.
Best way is to connect with facebook support. Sms sending is automatical process so you need to make them pay attention to such issues manually. Or maybe there is some problems with mobile operator etc, and you can detect it also only by connect with support