I installed ios 8.3 on iphone 6 plus. After that the phone has no service. Checked the sim card in another phone and it is working in that phone.

I Upgraded the ios to 8.3 last night For iphone 6 plus. Since morning today there is no service and no cellular coonection. The phone connects to wifi though.
I Checked the sim card in my iphone 6 and it could detect the signal/ network, so sim card is fine. Seems an issue with 8.3 for iphone 6 plus.

Greetings Anuvratg,
It sounds as if you are having difficulties getting your iPhone to connect to your cellular network since updating your version of iOS to 8.3, is that correct? I would suggest that you troubleshoot using the steps in this article - 
If you can't connect to a cellular network or cellular data - Apple Support
Thanks for using Apple Support Communities.
Be well,
Brett L 

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