Hey all. I've had my Galaxy S4 for about a year now, and I've installed a plethora of custom roms. I'm currently running stock touchwiz on my device. I've noticed that my device can receive but not send MMS message. This has been an ongoing problem for several months and I haven't been able to figure it out. Before I switched to stock 4.4.2, I couldn't even get MMS messages, and today my co-worker sent me a successful MMS. But I still can't send them. I don't have an APN settings option in my settings, so I updated my profile etc. through my Sprint Zone app. I'm completely lost and have noooo idea how to get my MMS messages to send. Any help would be greatly appreciated!