Really weird problem with iPhone 4s with Sprint?

So for the past few days, my iPhone hasn't been working right. First, I can't text anybody without an iPhone, otherwise it'll give me a text saying "You have this number on your blocked list" when I obviously don't have that person on my block list. I've even checked 3 times. Then, my phone completely refuses to connect to the internet or allow mew to text ANYBODY when I'm not in Wi-Fi. It'll tell me "Couldn't activate cellular data network. You are not subscribed to a data network" I'm just wondering why this is happening? I've tried turning off Wi-Fi and my cellular data settings and then turning them back on, turning my phone off, ect, and this problem is still occurring.

I don't need this password nomore on my iphone

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