Whatever works for you
If I'm travelling alone Mrs MarkE expects to speak to me every day unless I'm in an area without coverage. I find this an acceptable compromise between her insisting I only travel with her or not at all but it does mean I'm never completely alone.
If you have a pay as you go mobile, roaming charges mean you may accidentally put yourself out of contact because you don't have enough credit to receive calls. A cynic might forget to top up their phone before leaving (but not too often as she'd get suspicious).
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