I'm foing to get picky here.
Why does it matter? Why can't OP be themselves, taking as much time out as they need to? If people don't want to be friends with OP due to the length of taking time out, that's their decision. It still doesn't mean OP is doing anything intrinsically wrong.
What does it matter if people can contact OP in an emergency? Unless OPs job is being their carer or they're OPs dependent minor children or something like that, then OP isn't responsible for them in any way.
If there's an emergency and they'd like to contact OP for help and can't, that still doesn't mean OP did anything wrong. OP is not obliged to be there, waiting in the wings just-in-case, for someone's hour of need.
Obviously in switching off the phone OP knows they could miss eg a chance to say goodbye to a dying relative, but really how likely is that to happen (and is there anyone OP is sufficiently close to to mind about that)? It's a risk OP chooses to take and if that did happen, they're not coming across as the type to then blame others for why they didn't know.
And bluntly, if someone has already died, they will be no less dead by OP finding out a month later, when the phone is switched back on and emails checked. All it means is that OP won't have had that devestating news dropped on at a time when peace was already desperately needed.