Hi,
There are various network specification for each operators like airtel, BSNL, etc
Nokia 3110 supports GSM 900 / 1800 / 1900 so Airtel SIM card should work in your mobile.
Try using some other airtel sim cards and some other sim cards from other vendors as well. SOme times the problem with network chip may also cause this problem. so in such case, you can approach nokia service center to claim under warranty.
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Thanks
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