There are many USB adapters or dongles to e.g. B. Upgrade a notebook for 5 GHz Wi-Fi reception. (Sometimes they also come as a dual band USB adapter.) Despite an intensive search, I have not yet come across an adapter / dongle that can upgrade an older smartphone (Android) to the 5 GHz band (usually 802.11ac). Maybe I haven't found such an adapter / dongle yet? Or is there no such adapter / dongle for smartphones?
A smartphone is not a notebook. So it is very, very unlikely that your plan can be implemented.
No, there's no such thing.
