Call logs and photo captions need translating only where they contain non-English text. Most call logs show just names, dates and durations. Voice notes are audio rather than text, so ask us before ordering if one matters to your case.
A WhatsApp call log is mostly numbers: the contact name, the date, the time, how long you spoke. The labels around them follow your phone's language, so a log screenshotted on a Spanish phone reads "Llamada de voz entrante" and one on a German phone says "Sprachanruf". Those few words are all there is to translate. If your phone is set to English, there may be nothing at all, which is about as cheap as certified translation gets.
Photos work the same way. The picture itself needs no translation, but a caption, a date stamp or a message sent with it does if it's in another language. Voice notes are different, because there's no text on the page to translate. If one is genuinely important, message us on WhatsApp or by email before you order and we'll tell you what we can do with it.