Airtel introduced their own version of free night browsing last week, on paper the plans seems to be one and the same but their are some few difference between them so am listing them so you guys can sub for the one that suits your needs
1. Mtn Last From 12am-4.00am, While Airtel Last 12am-5am.
2. To Subscribe For MTN Night Browsing Send NIGHT to 131., While For Airtel Dial *312#.
3. Mtn only allows you to sub once for the whole night but Airtel allows you to sub and resub for as long as you want
4. For MTN You Must Be On MTN PULSE Before You Can Subscribe, While For Airtel You Must Be On Airtel Smart Trybe.
5. Mtn claims they allocate 500mb for their night browsing but in reality you only get 350mb and if you are lucky you get 400mb while Airtel is 500mb.
Thats Is What I Notice Between The Two Networks and I will keep updating as new info pops up

http://prorantblog..co.ke/2016/07/notable-difference-between-airtel-and.html?m=0