Why can't old phones use 5G network?

Even with a 5G SIM installed, older phones still cannot access 5G networks because they lack the specialized hardware and software needed to support this technology.

Many people think that installing a 5G SIM into an old phone will enable 5G, but that is not possible.

That's because older phones don't have the right antennas, radio chips, and modems for 5G.

5G technology operates on both new bands and millimeter waves that require specialized hardware.

5G New Radio protocols also cannot run on older modems that only support 3G or 4G.

Unlike software that can be updated, a phone's hardware is fixed and cannot be changed.

The solution of using an external 5G dongle is not effective and causes inconvenience to the mobile experience.

Therefore, upgrading to a new smartphone from 2019 onwards is the only way to fully use 5G.

This is also a necessary stepping stone for users to be ready for future technologies like 6G.

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Source: https://khoahocdoisong.vn/vi-sao-dien-thoai-cu-khong-the-dung-duoc-mang-5g-post2149057343.html