Please I don’t get network on this phone please help get the network

Your iPhone is seemingly running an older version of iOS, iOS 13, which can mean there's been some trouble applying updates and/or there's a nearly-full iPhone here, and either of which can cause problems. Have you had problems loading iOS 14?

For cellular connectivity issues, click or tap > If you see No Service or Searching on your iPhone or iPad - Apple Support

Start here→iPhone 7 Repair Program for "No Service" Issues - Apple Support

If your phone does not qualify, Go to Settings/General/About and look at Modem Firmware. Is the entry blank? If it is you need to reinstall it by restoring the phone to factory settings, then restoring a backup. Back up the phone first, of course:

1. How to back up your iPhone, iPad, and iPod touch - Apple Support
2. Restore your iPhone, iPad, or iPod to factory settings - Apple Support
3. Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

If the modem firmware DOES have a value you may have a hardware problem. The first step is what I just posted, but after that you need to contact Apple support using the Get Support link at the top of this page.