My phone can’t download nor update

Hi,

I'd you have enough storage space and you have a strong and reliable internet connection, please follow :

https://support.apple.com/en-us/HT201263

Hm. Not sure. You could try some basic things like :

1. Check internet connection-try different network (SSID) ;

2. Check available storage ;

3. Restart;

4. Force restart.

BTW, it is about iOS, not cellular update, right?

Also

https://support.apple.com/en-us/HT204770

Alright.

Do you receive an error code or notification?

Have you been able to follow the basic troubleshooting steps?