First, take your phone out of the box and check everything is included.

Next, insert the SIM card into your phone if it’s not already installed. 

Now, press and hold the power button to turn on your device.

Then, connect to a Wi-Fi network to make the setup faster.

After that, follow the setup instructions shown on your screen.

Open a browser and go to the AT&T activation page.

Enter your phone number and billing ZIP code when asked.

Type in your SIM card number if required.

Submit the details to start activation.

Wait a few minutes for the network to activate your phone.

Restart your phone once the process is complete.

Finally, make a call or send a text to check if everything is working.