My mom read my text messages,help!?

Ok im 16 and my mom would never read my texts even when im grounded and she takes my phone she will take the battery out and give it to me so i know now ones readin my texts. You really should have a talk with your mom tell her you really would like a little more privacy.Or just plain out ask her why she read ur texts? Idk but so phones have locks where u can type a pwords so no one other than u can read ur messages or even use ur phone. Im sorry ur mom read ur message and i dont think she should be that upset. :) Hope this helps