IPhone 4 picture sending problem?

I have an AT&T iPhone 4 but I use it with straight talk (I have a SIM card).It does not send/receive pctures from non iPhones. I have my MMS messaging turned on & I've tried resetting the network settings because I've heard that works but it doesn't. This is quite frustrating since only a few friends have iPhones & none of my family does.

Change your apn settings.
apn unlockr and choose the straight talk settings

Another thing to check is to make sure your data is enabled under settings, cellular, data enabled. If it isn't, this will keep photos from being sent.

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