How to receive and send picture messages on a unlocked iphone 4s?

Phone was on the At&t network and is now unlocked and on a 45$ unlimited straight talk plan

Look up straight talk apn settings, i personally now it's a bit tough to get it right cause you won't find the perfect settings in one place, rather google straight talk apn and look at the wiki page and then look at the striaght talk website and it's a combination of those settings, alway reboot after inputting and then try sending a pic to yourself

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