So what should i do?
how am o supposed to do with my phone if the sim card is no service and also there is no software Update ?
See if anything here helps.
iPhone - If you see 'invalid SIM' or 'no SIM' on your iPhone or iPad
iPhone/iPad - No Service or Searching.
iPhone - If you can't make or receive calls
iPhone - Carrier settings on your iPhone or iPad - Update
Is your device compatible to update to the new version? See the Apple Support article(s) below.
iOS 14 and iPadOS 14 Compatible Devices
iOS 13 and iPadOS are compatible with these devices - Apple Support.
iOS 12 is compatible with these devices.
IOS 11 is compatible with these devices If you can upgrade to IOS 11, you can upgrade to IOS 12
IOS 10 is compatible with these devices
See the articles below.
Get help with over-the-air iOS updates
Update – Can’t or can’t restore
Have you tried using iTunes on a computer or Finder if running Catalina to do the update?
Update software on iOS devices in iTunes on Mac
If you see an error when you update or restore your iPhone, iPad, or iPod
Updating iOS: common issues and solutions