Receive Mobile Code for Sri Lankan Number

 
I am in Sri Lanka (+94). I am not receiving any code when I try to register my number. 
 
Now I have "Code has been successfully sent to you. Attempts left: 0" but I never got the code.
 
Try with another phone number.
 
Suminda Dharmasena: I am in Sri Lanka (+94). I am not receiving any code when I try to register my number. 
Please be aware that some mobile service providers in many countries block foreign SMS text messages on their more economic service plans and only provide the service with their more expensive plans.
 
I am getting SMS from all other registration and 2 FA services. 
Reason: