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Nigeria. And the funny but annoying thing is that the CBN(Central Bank Of Nigeria) approves it

Very cool. I have some Nigerian friends here in Switzerland. I understand that there is a lot of currency traded in Nigeria using phone credits. Is that true?

I also heard that there is now big Bitcoin usage in your country. Do you use Bitcoin? If yes what Wallet is popular there?

Yes, that's right. I do use bitcoin though not everyone accepts BTC as a means of transaction as a great number of persons are yet to be Cryptocurrency literate.
The number of stores accepting BTC is increasing though and every day the population is getting expose to Cryptocurrency.
5 years from now, I believe the exposure in cryptocurrency will be huge.
And the most popular wallet over here is LUNO