If you registered with Serviis but you are not receiving the activation code through SMS, do the following steps:

1) Make sure that your SMS inbox is not full

2) use the following codes to remove any SMS block service could be added previously:
ZAIN Users:
#002# dial
#351*1234# dial
#35*1234# dial

STC Users:
Send this code as an SMS: 3322
To: 900

Mobily Users: 
Send this word as an SMS: resume
To: 604445

If the previous steps did not work, try with a different mobile device.