iOS iPhone 5s/c Sprint Unlock with Rsim Air 2

I am using RSIM V8.8 for US Sprint 5S; I did all the procedure above, I can see all the 5 carrier bubbles populated but the Airtel word is missing. Carrier is showing as CarrierLab 16.1 and even the line is recognized as airtel but I am unable to do calls or anything with SIM. If I call the number from other phone, it says busy tone. Please help if I need to anything else.

Thanks,
Kumar
 
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