1. Convenience: Many people find it more convenient to buy mobile airtime directly from their phones using mobile money services or banking apps. It saves time and eliminates the need to physically purchase a card.
2. Availability: In some areas, paper card mobile recharge may not be readily available or may require a trip to a store or kiosk to purchase. This can be inconvenient for people who live in remote areas or have busy schedules.
3. Security: Some people may be concerned about the security of paper cards, as they can be lost or stolen. Buying airtime directly from their phones using mobile money services or banking apps may be considered more secure.
4. Cost: In some cases, buying airtime directly from a phone using mobile money services or banking apps may be cheaper than purchasing a paper card. This can be particularly important for people who are on a tight budget.

Overall, the shift away from paper card mobile recharge in Nigeria is likely due to a combination of convenience, availability, security, and cost factors.