I cant activate my iPhone because I can’t update my phone

Hi - to update your phone, please have a look at these links.

Update your iPhone, iPad, or iPod touch

https://support.apple.com/HT204204

If your iPhone, iPad or iPod touch won’t update

https://support.apple.com/HT201435

If you see an error when you update or restore your iPhone, iPad, or iPod

https://support.apple.com/HT201210