In my experience, the carton does not contain a manual, just a multilingual start-up leaflet. However, there is almost always a link to a copious manual in the language of choice. If all else fails-read the instructions.Your phone has a manual? I don't think I've had a manual with a smartphone since, well, not for years and years. I do purchase more phones than many people, because I buy and set them up for the whole family. iPhone and Androids and even a [now broken] Windows phone.
If I have a problem, I either Google or YouTube it. The answer is almost always out there.