Do they not have a site you can go to? thats what usually happens.

 

You need to set the Access Point Name settings (APN) in the phone for your wireless carrier. A simple google search would have found these settings which I just copied and pasted here with a few typo fixes:

On the device, tap the Menu icon (or Applications > Menu)

Select Settings > Wireless & networks > Mobile networks > Access Point Names.

Press the Menu key and select New APN

Name: Jawalnet
APN: jawalnet.com.sa
Proxy: <Not set>
Port: 8080
Username: <Not set>
Password: <Not set>
Server: <Not set>
MMSC: http://mms.net.sa
MMS proxy: 10.1.1.1
MMS port: 8080
MCC: 420
MNC: 01
Authentication Type: PAP

Remember to hit Menu, Save, then tap the round button to highlight it which enables the new APN. Give it a few minutes and you will see the 3G/H icon and arrows in the status bar at the top. You're good to go.

 

Don't worry then as you do have 3G set up already. H is the faster version of 3G so it's better