Issue while making calls

Hi Team,
I am new to the community.I am using iPhone 5S for past 6 months and from India.
Issue is depending upon the signal the network will be changing from 3G to LTE in my phone.
While this is happening I am unable to make calls or receive calls.
Only When i try for 6 to 10 times I am able to call.
I tried all possible troubleshooting steps as suggested by Apple support,still no luck.
I am still using IOS 7.Will an upgrade help me ??
Please advise..

Hi ananthj,
Welcome to the forum!
To isolate the case, you can try a different SIM card on your device. This is to check if you will encounter the same behavior. If it's still the same you can reset the phone to the factory setting. Just don't forget to back up your files first. Check the link below for the step-by-step procedure:
http://www.windowsphone.com/en-us/how-to/wp7/basics/restore-a-backup-to-my-phone
http://www.windowsphone.com/en-ph/how-to/wp8/basics/reset-my-phone
Hope this resolves your issue. 

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