To Subscribe Follow These 5 Steps

1. Download BBGEN.apk [Download] and install. Launch it To generate a random blackberry IMEI.

2. Tweak Your IMEI - Click Here To See How To Tweak IMEI (Rooted Devices) (use the same procedure on the page)

For Non Rooted Devices -. [Click Here]

Download BBGEN.apk, and learn how to tweak android devices from this link (both rooted and non rooted) http://www.alltekng.tk/2017/09/airtel-3gb-for-n1500-blackberry-android-data-plan.html
3. Go To Settings > More > Mobile Networks > Airtel

Then Configure Your Phone With These Settings

Access Point Name : Airtel NG
APN : tointernet.ng.airtel.com
Username - internet
Password - internet

Note - Leave Proxy And Port Empty

4. Recharge Your Phone And Subscribe with *431#

5. Reboot Your Device and start surfing .