Facebook SMS Service is nice feature and it can be setup
easily through Mobile tab on your Facebook Account Settings, after that
you will start receiving messages according to your preference. The
mobile provider will charge you a certain amount by weekly or monthly
basis to keep sending it. but if you need to remove the Facebook SMS
Service, it is not easy as you think, even if you removed your mobile
number from Facebook Account Settings the Mobile Operator will keep
charging you . I faced this issue on my Mobily (Saudi)number, every
Friday morning I will get two messages stats “ your last call costs SAR
3” and “ you are still registered to the Mobily Facebook SMS service”. I
called customer support, went to their office nothing happened. finally
I got a solution one of my friend working as a mobile technician.
The solution is as follows
Mobily
Send a SMS to 606050 contains“UF” without quotation marks in subject field.
if you need to subscribe again send “F” to 606050.
STC
Send a SMS to 86677 contains“UF” without quotation marks in subject field.
if you need to subscribe again send “F” to 86677.
Reference:
ShameerOnline
http://www.shameeronline.com/how-to-unsubscribe-from-mobily-ksa-facebook-sms-service/