Mr A:
Here is the list of Airtel data bundle plans and subscription codes:

AIRTEL LITE
Data Allowance: 250MB
Expiry: 30 Days
Price: N 1,000
Activation Code: *141*11*4#

AIRTEL MIDI
Data Allowance: 325MB
Expiry: 30 Days
Price: N 1,300
Activation Code: *141*11*5#

AIRTEL SMARTPHONE 1
Data Allowance: 650MB
Expiry: 30 Days
Price: N 2,000
Activation Code: *141*11*6#

AIRTEL SMARTPHONE 2
Data Allowance: 1.3GB
Expiry: 30 Days
Price: N 3,000
Activation Code: *141*11*7#

AIRTEL PLUS
Data Allowance: 3.9GB
Expiry: 30 Days
Price: N 5,000
Activation Code: *141*12*1#

AIRTEL MAX
Data Allowance: 6.6GB
Expiry: 30 Days
Price: N 8,000
Activation Code: *141*12*2#

AIRTEL PREMIUM
Data Allowance: 13.3GB
Expiry: 30 Days
Price: N 15,000
Activation Code: *141*12*3#

AIRTEL PRIME
Data Allowance: 19.9GB
Expiry: 30 Days
Price: N 22,000
Activation Code: *141*12*7#