If the aim is internet over the mobile network, look for the LTE devices and the MikroTik MiniPCI-E adapter; for a fixed line there is an AC1200 VDSL/ADSL modem router. The same section also holds Wi-Fi and Bluetooth USB adapters from 150 Mbit/s to 5374 Mbit/s, the fastest of them with 6 GHz support. They are the simplest way to give an older computer a wireless connection again without opening the case.
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If the aim is internet over the mobile network, look for the LTE devices and the MikroTik MiniPCI-E adapter; for a fixed line there is an AC1200 VDSL/ADSL modem router. The same section also holds Wi-Fi and Bluetooth USB adapters from 150 Mbit/s to 5374 Mbit/s, the fastest of them with 6 GHz support. They are the simplest way to give an older computer a wireless connection again without opening the case.