The iPhone 13 is rumoured to feature next-gen 'vapour chamber' cooling tech.
Apple is confirmed to be testing the technology, but it is not clear if it will be ready for a 2021 launch.
The cooling system is a miniature version of those seen on high-end gaming computers.
A liquid is evaporated by the heat generated by the device, and then the thermal energy spreads out through the whole of the casing.
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Improved cooling would mean less chance of over-heating and potentially faster speeds.
