CREATE TABLE table_name_6 (wireless_network VARCHAR, screen_type VARCHAR, internal_storage VARCHAR)

Which wireless network did LCD displays with 4 GB of internal storage use?
SELECT wireless_network FROM table_name_6 WHERE screen_type = "lcd" AND internal_storage = "4 gb"
SELECT "wireless_network" FROM "table_name_6" WHERE "4 gb" = "internal_storage" AND "lcd" = "screen_type"