Airtel — updating to airtel 4g

Address:Dehradun, Uttarakhand, 248001

I have an iphone6. Got an upgraded airtel 4g sim today. After the previous sim showed no service i inserted the new sim. It had signals but an error message kept showing up saying cannot set up the sim card. tried restarting the phone but now it shows no service. I am left with no working connection. Is there a way to get back to the previous settings or get this new sim started? Immediate help required.
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