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Great to see someone using a feature phone. I use one myself as a secondary/ backup phone for receiving OTPs, and as well to sign up for multiple accounts.
But lite has to do with RAM consumption on low end entry level Android phones na, its not about the bandwidth consumed on the data network.
So the low end phone users will still suffer with the full fledged resource hungry Airtel thanks app unless they tell Airtel 'thanks but no thanks'