Unable to activate iPhone 7

Greetings akrasi-barimah, 

Thanks for the screenshot of your iPhone 7. We do see the error message there about activation and how an update is required. 

The article you reviewed, If you can't activate your iPhone is a good one, but the following may provide additional assistance. If you see an Update Failed or Apple Pay Not Available alert after iOS update or restart

If the issue persists, you’ll want to connect with Apple or an Apple Authorized Service Provider on seeking service for your device. You can locate what’s near you starting with the iPhone repair site - iPhone Repair

We also want to make sure you’re aware of the following program - iPhone 7 Repair Program for "No Service" Issues and keep in mind the details under ‘Additional Information’ for how long the program is in effect. 

Thanks.