Unfortunately, settings for use of mobile internet on your iPhone 3G cannot be sent by SMS.
It is, however, possible to manually set up mobile internet on your iPhone 3G. Choose Next for step-by-step instructions.
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. Tango advises against installing this update.
Choose Cellular Data Network.
Edit details for Cellular Data:
Under APN, enter internet2.
Under Username, enter tango.
Under Password, enter tango.
Return to the Start screen.
Switch off the iPhone 3G and restart it in order to activate the settings.