Use a Phone Cooler

Yes, computers aren’t the only ones that could use a fan during a hot day; you can also get a phone cooler for your iPhone.

Phone coolers do exactly what you’d expect. You can connect one to your iPhone’s USB-C or Lightning Port, and then a small fan will start cooling your iPhone from the back. 

There are many phone coolers in the market, but you can try this phone cooler by Black Shark. What’s cool about it is that it comes with a temperature display to let you know how cool or hot your iPhone really is.