You might also look into a syndrome called "texter's neck" or various other nicknames. It is pain in the upper back, shoulder, and neck radiating into the arms that comes from holding your cell phone down in front of you when texting, playing games, or surfing the web. Over time, the position looking down irritates the nerves and can cause pain, tingling, and numbness down the arms. I had it for a while and as soon as I stopped reading my cell phone while laying in bed for long periods, it went away.