Sir my phone update is 12.5.2 then when come the iOS 13

iOS 13 isn't available anymore.

if you have an iPhone 6S or newer, you can update to 14.5.1

If you have an iPhone 6 or older, the highest you can update to is 12.5.3

Update your iPhone, iPad, or iPod touch -

https://support.apple.com/en-us/HT204204

Vinayak ~ See if your iPhone model is compatible:

iOS 13 and iPadOS are compatible with these devices

iOS 14 and iPadOS are compatible with these devices

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