I can send texts but can't receive

I have the cricket iPhone and I can send texts perfectly fine but I'm not recieving messages! I only receive messages when someone calls my phone then I get them all. I have tried everything, please I need your help! And FYI my sister has the same phone and she has 0 troubles

Have you tried restart if not I would call apple-800-694-7466

Have you tried restart your computer.