So yesterday, I decided to dig some more into the offers by the different telcos. And Airtel currently has the best value for money offer. Also Glo has great matching offers but when you consider downtime that is inevitable with Glo, you won't take it as a comparison.
The great data plans from Airtel are of two main categories: Android Pack and Mega Pack.
|ANDROID||ANDROID 1.0||1.5GB||1,000||30||*496#||Usable on all devices @ 1k/kb all day|