If you are looking for an official user manual or technical paper, you can find them by searching for the specific model code (e.g., for the F04) on official support platforms:

Use the Manuals & Software Download Center to find guides by entering a valid model code.

For older or regional models, technical specifications and FCC ID information can often be cross-referenced on databases like WikiDevi .

Could you confirm the found in your phone's "About" menu so I can locate the specific PDF for you?