My mother, 81, is in a nursing home with dementia. I had a very basic phone installed so we could keep in touch. Otherwise, I was afraid that she'd constantly bother the staff to call me.
The first couple of months, there was no problem. Then she started pulling the cord from the wall jack and breaking it. After replacing the cord several times, the wonderful and patient maintenance staff finally put the phone up on the wall (it was on the table next to her bed) and put duct tape over the jack and little bit of exposed cord so she can't yank it out.
A couple of days ago she disconnected the handset and apparently threw it out because no one could find it. You can't ask her why she does it because she blames it on the staff or on my father (from whom she's been divorced almost 40 years and who's never visited.. not that he should). On Friday I brought the handset from an old phone I had. Yesterday she yanked it out but at least she didn't break the plug so maintenance plugged it back in and put duct tape over the hole. Hopefully this will work but somehow I doubt she'll leave it alone for long.
As for the TV, she got it into her head to remove it from her room. Which meant that she managed to unscrew the cable, climb up on furniture to remove the plug (which was high up on the wall) and carry or push it into the hallway. I don't know where she got the strength to do it. It's an older model that was sitting securely on a small dresser. The TV was put back into her room because she raised such a fuss saying that it was stolen. The nurse suggested that I get a small flat screen and have it mounted on the wall. I'm afraid that won't stop her from climbing up again if she gets another delusional idea. I thank God that she didn't hurt herself this time.
I can't make her understand that she shouldn't do the things she does because she doesn't acknowledge doing them in the first place. It's always someone else's fault. So I'm debating removing the TV from her room for her own safety (although chances are that she won't go to the day room or main dining room to watch TV) and disconnecting the phone service if she breaks the phone again.