Customer Care agents are notorious for subscribing unsuspecting customers to the most expensive data plan. Like they say, the price for ignorance is expensive; you can now choose the best data plan for your device.

MTN
OPTION 1 (Best)
Night Plan Reloaded
OPTION 2 (Better)
Data Share
OPTION 3 (Good)
Better Me

Airtel
OPTION 1 (Best)
Android 1+1 Offer (Only if you are eligible)
OPTION 2 (Better)
Android Plan

Etisalat
Though they are blazing fast, they have the most expensive data plan. However, they also have affordable Data Sharing through Resellers like MTN.
Data Share (Best Option)

Glo
Glo Overload

Click here to get full details of plan and activation codes