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A 21st-century migrant's checklist: food, shelter, smartphone

Smartphone maps, global positioning apps, social media and WhatsApp have become essential tools in moving across borders safely

Refugees in a park on Sunday, after crossing the Serbian border into Hungary near the town of Asotthalom. Their smartphones let them post real- time updates about routes, arrests, border guard movements, transport and accommodation, and stay in touch with their families.

Belgrade, Serbia

THE tens of thousands of migrants who have flooded into the Balkans in recent weeks need food, water and shelter, just like the millions displaced by war the world over. But there is also one other thing they swear they cannot live without: a smartphone-charging station