Settings for mobile internet can not be sent to your iPhone 3G via SMS.
You can configure your phone manually for mobile internet. Follow the step-by-step instructions below.
Note: These instructions apply only to an iPhone 3G running iOS. If your device is running a different software version, the images may be different and other instructions may be required. To check the software version, choose Settings, General, About, Version. Click here for instructions on how to update your iPhone 3G. The iOS4 update installation is irreversible and may result in sluggish menu navigation on your iPhone 3G. BASE advises against installing this update.
Choose Cellular Data Network.
Edit details for Cellular Data:
Under APN, enter gprs.base.be (be aware of the dots).
Under Username, enter base.
Under Password, enter base.
Return to the Start screen.
Switch the iPhone 3G off and then on again to activate the settings.