Device unable to detect cellular signal once went to low network

nakul ~ As your iPhone 13 Pro Max could be 3½ years old, it's worth checking for a weak, aging battery. It may not be supplying sufficient power to the iPhone's antenna to re-connect with cell tower signals. So...

Does your iPhone 13 Pro Max still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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nakul_5G wrote:

It’s iphone 13 pro-max having ios 18.2.1, if user went to some places like parking basement or office washroom where usually network is either no or very low, usually user lost the signal and same happened with iphone 13 pro max. But, good (except iphones) device recovers the signal once user came out from low/no signal to good coverage/signal area but our beloved and pricey don’t. It shameful to say users are paying good amount to apple for iphone and it doesn’t work as per simple 3gpp standards. Simple handover or signal search engineering missing from apple modem engineering team. Apple should start to sell Nokia’s feature phone because they are far better than iphone in signal or network connection recovery. If you have little knowledge about modem and how it work then please fix this issue.

There is NO Apple here in these user to user technical forum.

Cellular data is something you pay your cellular data monthly to use, not Apple.