If I am not mistakenly almost everyone in our country speaks pidgen English and some other sub countries wetin us also understood and speak pidgen as well. For sure, Hausa is another well known and understood language that is also been used across other African countries and worldwidely.
Almost but not all as there are Nigerians born in Nigeria who cannot express themselves in pidgin English.
If you go to Norther part of the country, you will see them. Those that are riding bikes, cars, buses for business there does not even know amount in English. You have to tell them in Hausa before they will understand you. It was strange to me when I first went to Northern part of the country and they are far more than those that speak English and Pidgin English.