To find the total storage after buying the additional bytes, you will need to add the two amounts of storage together.
The current storage of the phone is: \(1.28 \times 10^{11}\) bytes
The additional storage you can buy is: \(384,000,000,000\) bytes, which can be expressed in scientific notation as: \(3.84 \times 10^{11}\) bytes
Now, we can add the two amounts together:
\[ 1.28 \times 10^{11} + 3.84 \times 10^{11} = (1.28 + 3.84) \times 10^{11} = 5.12 \times 10^{11} \text{ bytes} \]
Thus, if you buy the additional bytes, your phone would have:
\[ \text{Total storage} = 5.12 \times 10^{11} \text{ bytes} \]