To check if an English language voice is installed, open your phone's settings and select the speech option.
Now tap on the speech language option, and select any of the English language voices from the list. If you are not a native speaker, we recommend the English (United Kingdom) voice, which is slightly slower and over-pronounced, making it easier to understand.
This will download the selected voice, which may take a few minutes to complete. Once downloaded, the phone prompts you to "restart to finish installing the update". This last steps takes another few minutes, during which you won't be able to use your phone.
In the end, set the voice back to your original voice.