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Which app are you using for MMS? Have you double checked your APN settings? Is what you are trying to send larger than the app set limit for MMS messages? One thing to consider is, that although you can set and send messages that are fairly large, doesn't mean the network or phone receiving them will be able to receive them for various reasons. Some cellular providers put a cap on MMS sizes where some devices will just naturally reject something very large because the device has a software cap on the file size it can receive.