My phone is how my family reaches me in an emergency. How can I help them if they can't reach me? It would be irresponsible to leave home without it. Internet

My phone is how my family reaches me in an emergency. How can I help them if they can't reach me? It would be irresponsible to leave home without it. Internet on the phone is nice to have, but it's phone calls and texts that need to work for me. (I prefer actual phone calls, because that's what I grew up with)