Main thing is to download maps for Googlemaps for offline use before you leave home, for which you will of course need several GB of storage on your phone. Android phones with an SD card slot might be a better proposition for this than non-expandable iphones.
Anyone stuck with a phone with insufficient storage might find it easier just to buy a £100 satnav with the necessary maps on it.
Roaming costs aside, tourist areas often have poor coverage for mobile data. I will be making sure I have the necessary maps downloaded to Google maps before we set off through the Alps in a few weeks.
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