4G mobile phone with 5G package basically does not have much speed, you have to extra set of packages, extra money you take 4G mobile phone want to use 5G package that is impossible, because your 4G mobile phone does not support 5G Internet access, so you do not bring 5G network, do not use your network or use 4G traffic, so you are not able to enjoy 5G treatment, Only enjoy 4G treatment.
4g mobile phone 5g package is still 4G network speed, at most a few hundred megabits per second