Iphone 3g does not let me send picture messages

If you're in the US and using T-mobile your phone is 1) jailbroken--in which case Terms of Use prohibit further discussion or 2)you've purchased an unlocked phone from another country and using a T-mobile SIM in which case you'll have to contact T-mobile.

Go into settings then messages and turn your MMM messaging on. This should get you going again.
PS no need to turn Heading on if you don't want to.

Walter H. that worked for me. There must have been something about upgrading to 4.0 that made no-picture-messaging the default. Thanks. Your post helped.

I am not able top send pictures unless to known email adress, not to phone numbers. The small picture of a camera is not present on the screen like it is on my daughter's phone.