My Blackberry is activated by pushing one (big) button. My cell often times gets activated accidentally. Conversely, my cell is difficult to turn off and that has never happened accidentally. I dont know if MCs cell phone is the same way. Im not familiar with her cell, so Ill defer to those who are.
I have the same model of LG phone as MC. I don't put mine in my pocket, because, well, I am a girl and carry a purse. So I don't know if it easily turns off when in a pocket.
I do know, however, that to turn it off you have to hold the "end" button for several seconds (estimate of 3 to 5 seconds of continuous pressure). Also, it has an automatic lock that locks the keys after about 22 seconds. This prevents the other keys from accidently being used when in a pocket, for example. So, that being said, if her phone was in her pocket, and it was bumped or pressed due to outside pressure, the chances of it turning off are slim.
In order to unlock the phone, you have to press a button and then press the "ok" key on the phone. Pressing "ok" directly won't unlock it.
I don't know if the lock feature can be turned off. I am pretty savy when it comes to devices, and I have searched the phones features and have yet to find a way to turn it off. I could be wrong, as it may be hidden within a feature of a feature that I didn't discover.
But, when I first got the phone, I didn't like the lock feature and looked for a way to disable it. I couldn't find it, so I realized I would have to get used to it.
Let me know if you have any other questions regarding this phone.