Help Lock after a text

[TomLaws1993]

Hey.
Everytime I send a text my phone will lock itself everytime. I then turn it back on, press ok where its showing my credit and it locks itself again. Any reason why? Or is my phone just f**ked. Im using the built in message thing, not downloaded.

 

[rosered]

I think you can get your network to turn off the messages with your credit on... would this help? Can't say that I have seen the problem before otherwise.