Several months after MTN introduced the Awoof data bundles, Airtel have followed suits and theirs is almost an exact replica of Mtn’s. The implication is that with #100 now, you can get 200mb which lasts for 3 days, 200 gives you 1gb which lasts for 1 week and so on.
Attached is a screenshot I took today and it provides more details.
NB: It is Sim Selective i.e It doesn’t work for all sim, but you may try your luck
Just Dial *141*241# and follow the instructions