To help you fully unplug from email, we’ve compiled six of the best out-of-office message examples that are perfectly suited to you, your company, and this vacation-heavy time of year.
Finally, if leaving a private mobile phone feels like revealing too much, you can instruct your customers to contact you via email with the “URGENT” referenced in its subject:

I give my folks scripts because, otherwise, I end up with long winding OOOs that talk about why they’re out but not what the writer/caller should do to get help (staff is 1/3 entry-level with varying degrees of professional office familiarity). I do not have the time to micromanage to this level, though – if I see an off-spec OOO, I send the how-to guide and remind them that they need to tell people who to call while they’re out or to mention the specific dates, but most of them have good judgment enough not to be totally inappropriate to the point I need IT to intervene.
Meanwhile, I do sometimes put up long ones when I will be away for some days during a season in which there are a confluence of three or four very likely reasons someone would contact me, and who else they need to contact isn’t the same. Like, it’s high llama grooming season, and generally during this month I get two or three requests per week for each of llama bleaching (for which my backup is Stella), llama shaving (for which it’s Arturo), and llama perming (for which it’s Carter). My message says I’ll be out until blah blah, and if it’s not an urgent llama grooming issue, I’ll get back to you after that, but meanwhile, for urgent llama grooming here’s who to call.