"Reason why we cannot use 4G SIM on a 3G device
4G LTE feature lies in Hardware, the processor of a smartphone. So, you cannot switch to 4G with a software as depicted by many blogs. Companies like Qualcomm and MediaTek have come up with processors that support 4G LTE technology with 4G modem inbuilt in the processor"
sursa: https://www.quora.com/Can-I-use-a-Reliance-Jio-4G-SIM-in-a-3G-phone
Si telefonul trebuie sa fie 4G. Telefonul mai bun, suporta o cartele mai slaba. Nu si invers.
Daca suporta doar 3g telefonul doar 3g o sa foloseasca, indiferent de cartela, asta e dezavantajul.
https://www.diffen.com/difference/3G_vs_4G
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