What should I do to avoid apps updating whilst I'm abroad?

Apps update themselves automatically, but you can choose for them to update only when you are in Wi-Fi mode to avoid unexpected costs.

Be careful, when your Wi-Fi signal is weak, your mobile could be connected automatically to 3G or 4G and you maybe charged for internet without knowing. If you dont want to be charged from mobile data, deactivate Wi-Fi assist.

1/2 For Android

1/2 For Android

Go to settings on Plays Store, then auto-update apps and select "over Wi-Fi only".

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2/2 For iOS

2/2 For iOS

Go to settings, then "iTunes store and App Store" and de-select "update".