How to get picture messaging on my iPhone 2g with T-Mobile?

I bought an iPhone 2g from a friend and I've been trying all day to get MMS for it and nothing has worked at all.whenever I try to save an APN it doesn't work and I can get it to send about 80 or 90 percent then it just stops. I need help because I want a fully functioning phone.

You have to have your cellular data on.

Go to T-Mobile's website and click on support/community and then find the options for using phones that T-Mobile does not sell. If you can't find your answer there, then you can ask.