What reason could there be for someone not using Wi-Fi in Nepal?

My son is in Nepal but his phone is no longer getting my whatsapp messages and we have no communication via his iphone… What could be the reason for this as he was last in Kathmandu, staying with a family and had perfect Wi-Fi connection?

Wi-Fi is distributed by low power RF equipment and thus has a natural limited range. The can also be locked by owners. Your son just walked out of the range of an open one.

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