FirstAtlantic Bank (later FirstInland Bank and now FCMB) pioneered transfer to phone nos in Nigeria when it introduced FlashMeCash about 15 years ago.
The whole of Kenya, including the bottom of the pyramid - mama mbogas (vegetable stall vendors), the juakali (small-scale traders and artisans), boda boda drivers (okada), everyone - uses MoMo (mPesa, Airtel Money). Your number is your Wallet.
Nothing stops Nigeria. It’s 2023