My ipad 4 ios 10.3.3 couldn't activate

Start here >>> If you can't activate your iPhone or iPad (Wi-Fi + Cellular) - Apple Support

If you are experiencing difficulties with (re)activation of your iPad, you may have more success if you connect your iPad to a Windows PC (with iTunes for Windows installed - or more recent Apple Devices App) or a Mac computer (with iTunes or Finder - as appropriate for the installed version of macOS). Once connected to your computer, your iPad will be detected - and you should be able to activate using iTunes.

1. Make sure that you have the latest version of macOS or the latest version of iTunes.
2. Check that your computer has an Internet connection.
3. With the cable that came with your iPad, connect your iPad to your computer. Locate your device on your computer.
4. Wait while your computer detects and activates your iPad:

• If you see an alert that shows "Set up as New" or "Restore from Backup", it means your iPad is activated.
• If you get an error message that says the "activation information was invalid" or "activation information could not be obtained from the device", use recovery mode to restore your iPhone.

A restart of your WiFi Router may also be helpful.

To restart you home router, disconnect power - then wait at least 30 seconds before restarting. When you router has rebooted (which may take several minutes), force-restart your iPad:

Force restart iPad (models with the Home button)

Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.

Should it be necessary to escalate your issue to Apple Support, the quickest route to engaging with Apple Support will be via the Support link at top-right or bottom-left of this page - or using this link:

Official Apple Support

According to MacTracker, the iPad (4th generation) (Wi-Fi + Cellular) only supports a couple of LTE bands.

"Networks: GSM/EDGE (850, 900, 1800, 1900 MHz), UMTS/HSPA+/DC-HSDPA (850, 900, 1900, 2100 MHz), LTE (Bands 4 and 17)"

If you are in a part of the world where carriers have shut down their 2G/3G networks, and the carriers are also using different bands for their 4G/LTE service, maybe there is no cellular network to which your iPad 4 is able to connect. You may want to check with your carrier.