As noted above, temper expectations with those concerned about you.
Several years ago a mom came here and other places frantically looking for her missing son when she hadn’t heard from him for a couple of days. Turns out he wasn’t missing. IIRC, he had fallen asleep without powering down/off his device and killed the battery. Took him a couple of day’s to regain connectivity.
I’ve even been in relatively populated areas where the cell signal has been so weak I haven’t been able to send even a plain text message.