This incident took place in Los Angeles, CA. I had purchased a new cell phone in late 2007, and I'd say a few months afterwards, in the beginning of 2008 was when I believe a demon briefly took up residence in it.
I had just returned home from running a few errands, and I set my phone down on my dresser in my room. I turned on the TV and began watching it, when something distracted me for a moment. A small black cloud-looking substance (small enough to fit in the palm of my hand) hovered into my room, over to my phone, then disappeared into it!
I didn't pay any attention to it, thinking it was a glare or something, so I went on with my day. Well, from that moment on, I started having problems with my phone: I had a hard time reaching people I wanted to reach as I would get a lot of static when trying to call out. Where I would often get calls from family, friends, and acquaintances, all of those calls had stopped. No one would call me and I never got any "missed call" messages on my phone. This went on for about one to two weeks. Then, one day, out of the blue, my sister called me. When I answered, she said, "Mya?" I said "Yes." She seemed concerned, but she didn't say anything. She just went on with a normal conversation.
Then other people started calling and telling me that they had been trying to call me for last several days, but just couldn't get through. I blew it off, blaming it on bad reception.
But then, I got a call from an editor I had been working with on a project. She too complained about not getting through, but then she said something that got my attention. She said on one of the times she tried to call me, an ugly, demonic-sounding voice answered, saying "Mya's not here today!" She said it kept saying it over and over, until the phone went dead.
I replied "What?!" Still, I didn't believe it, until it hit me. I thought back to the day that I saw a sliver of a black smoke-looking thing zip into my phone. I put two and two together and knew that must've been a demon. I guess it finally moved on and that's what allowed the calls to break through.
To this day, I wonder what it was saying to people when they'd try and call? It must've been scaring them off. My friends and family never came out about it. I got the feeling they'd rather not.