Simply dial *312# and reply with 1 to migrate to Airtel SmartTRYBE; and then for 1GB Airtel data which costs N500, reply with 2 and it is valid for 7 days.
For 500MB Airtel night plan data which costs N25 and 1.5GB Airtel night plan data which costs N50, reply with 3. The duration of the Night Plan is from 12am to 5am.
Airtel now offers 1.5GB data for N200 for the night plan; and for 200MB Airtel data at a cost of N200 plus 30Min call, reply with 4. It is a weekend plan from Saturday to Sunday.
One benefit that the Airtel Night data plan has is that you can subscribe to as many times as you can in one night, unlike that of MTN that you are limited to only one subscription per night.
Airtel night plan is better than the MTN Night Plan of 500MB for just N25, because with MTN night plan each SIM card is entitled to a one-time activation per night.
However, Airtel night plan can be renewed if exhausted, meaning that you can subscribe again after exhausting the initial 1.5GB. You can also use 3GB for N100 in just one night.

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