My iPhone 5 is not getting LTE after upgraded to Airtel 4G sim?

My iPhone 5 is still not getting LTE in Bangalore and Visakhapatnam after upgraded to Airtel 4G sim from 3G sim? It show only 3G sign even enable LTE in setting… How do i get LTE in my iPhone 5?

Go to the store something probably happened

Contact Apple Care for technical support or sign up online for Apple Genius Bar appointment at your nearest Apple retail store. All the best.

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