Hie my phone keeps on saying l can’t call or receive calls unless you update then if I go to reinstall it keeps on saying error occurs try again later please help

Perhaps these articles will help:

Manually update your carrier settings on your iPhone or iPad - Apple Support

If you can't make or receive calls on your iPhone - Apple Support

If you see No Service or Searching on your iPhone or iPad - Apple Support

See this Apple article: If you see No Service or Searching on your iPhone or iPad

If you see No Service or Searching on your iPhone or iPad - Apple Support

Optimize the Wi-Fi connection, see the following Apple articles:

Connect to Wi-Fi on your iPhone, iPad, or iPod touch

Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support

If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network

If your iPhone, iPad, or iPod touch won't connect to a Wi-Fi network - Apple Support

Recommended settings for Wi-Fi routers and access points

Recommended settings for Wi-Fi routers and access points - Apple Support

If you need help with your Wi‑Fi password

If you need help with your Wi‑Fi password - Apple Support