Not getting any iOS updates..!

namoju wrote: "Is my device eligible??"

Confirm your iPhone Model Name here:

Settings > General > About > Model Name

...Then see if that Model is in this list:

iOS 13 and iPadOS are compatible with these devices

You can find Apple Support Articles such as the above by searching Apple's Knowledge Base.

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Unfortunately, iOS 13 is not supported on your model year. It is only the model year after that (6s) and later that will support 13 and the upcoming iOS 14.

No, sorry, your iPhone 6 Plus (you have a 6 or 6 Plus, not a 6s or 6s Plus) cannot support iOS 13 or 14.

Your device is too old and it doesn't have enough RAM for iOS 13 or 14.