First option:

 buying a prepaid cards from any of the Omantel WiFi hotspots

 You can learn more how to use ibhar prepaid card from the following link: Click Here

 

 

Second option:
 

If you a dial-up/ADSL Customer you can also access Omantel WiFi through the same username and password that you are using to access your Internet

You can learn more how to use dial-up/ADSL Account from the following link: Click Here

 

 

Third option:

 subscribing for it through your Oman Mobile GSM Number.