D802 - LTE Band 40(2300 Mhz) is available, but not used?

Hi,

I've been going through a lot of posts for this, but I couldn't find a definite answer. Even though Band 40 is supported by D802's hardware(and also shown in the LTE bands in the hidden menu), used along with the Airtel 4G Sim Card(Karnataka, India), I still can't use it because it is disabled by software/firmware? Also, I can see LTE in the Network selection menu. How is it that I can see the Band for LTE(2300 Mhz) used by my carrier but can't use it??

Anybody able to explain this to me would be of great help!

Thanks!
- Amith