Closest access points to you is what matters. Wifič shows networks only in you neighbourhood (under 20 km).
Leave your comfort zone, throw away your SIM card. Instead use Wifič, Skype, Viber, Facebook or iMessages.
App cache all its data, so you may get through list of Wi-Fi around you even without internet connection.
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Red pins shows regular Wi-Fi with password.
Black pins shows Extra networks.
Green pins are Wi-Fi with no password.