If you already have a modem from another operator such as nawras,

 

1. Get a Omanmobile hayyak mobile SIM card from Omantel mobile shops
2. Insert The Hayyak / Omanmobile SIM in your modem
3. Connect the modem to your PC or Mac
4. Start the modem program
5. Go to Tools › Options › Profile Management
6. Press New to create a new Omantel / Omanmobile / Hayyak profile
7. Enter the below settings:

Profile Name : Oman Mobile
APN Type: Static
APN : Taif
Access number : *99#
Username : Taif
password : taif

8. Click the ‘Set as default’ button, click the ‘Save button’ & click ‘OK’ button
9. Recharge your Hayyak / Omanmobile   mobile account if your balance is lower than the price of your monthly package
10. Activate your monthly internet package
11. You will receive a confirmation SMS.