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I just got an unlocked Samsung Galaxey A5 a few days ago and all was workign well after impoting my SIM card untill about a half hour ago a friend tried to send me a picture and myu data qyuit working all toghter. How can i fix it?

I have a Samsung Samsung Galaxy S3 that i recently unlocked and moved to public mobile. I am able to get and send text messages and able to get pictures messages but i am unable to send picture messages. My mobile data is on and working. How can i fi...