Hello, Thanks for reaching out to me. Unfortunately, I’m out of the office from [DATE] to [DATE] with limited / no access to email. If your query can wait, I’ll be responding to the emails I missed when I return on [DATE]. If not, contact [NAME] at [EMAIL] or [PHONE] and he/she will take care of you.
Depending on your idea of holidays as no-business time of the year, you may decide to leave at least one communication channel open, or provide additional information in case of urgent inquiries. In any case, you can add the following information to the mix: You can provide your mobile number, while noting that it can be used only in exceptional situations You can leave contact information of a person that will handle correspondence in your absence You can inform your customers that you will only check emails with “URGENT” in their subject

You don’t need to turn off the “Driving” mode to make outgoing calls. And you can still access emails and messages as usual. The auto-reply will work as long as your phone in driving mode.
There’s a department at my workplace where this is common practice too. My old department worked with clients in similar ways, and I was half expecting we’d also be required to do it, but luckily that never happened. Further proof that, at this (generally progressive, flexible-working) company, your actual work-life balance heavily depends who manages you.