What is the most important thing to carry with you all the time?

The only thing that I need to have on my person at all times, including when I go to the bathroom, is my cellphone. As a wheelchair user, if I have an emergency situation, like if I fall,or if I’m unable to get up from the toilet for some reason, and my cellphone isn’t with me, it’s not a good thing. Because my husband’s hearing is waning and because my voice is not as strong as it was before my stroke, yelling for his help doesn’t always work. Although now that we’ve replaced our carpets with vinyl planks, sound travels further . Even so,I don’t feel fully safe without my cellphone.