Can not use Cellular data on SE Iphone

Hello Esma91278, we're here to help get you access to your cellular data.

Check to make sure that your data is turned on by going to your plan to activate usage.

1. Go to Usage.
2. Select Manage my data usage in the Usage section below the graph.
3. Toggle Data Off or On for the device you want to manage.
4. Select Save. 

Make sure your device has the most recent software updates to ensure you have the latest features. 

1. Go to Device Support.
2. Select or change the selected device brand and model.
3. Scroll to More Device Help.
4. Select Software updates if you see it. It only displays if there’s an available update for your device.
5. Repeat the steps to check for software updates for a different device.

Let us know if this helps, and thank you for reaching out to the AT&T Community Forums.

Jeff, AT&T Community Specialist

Are you also unable to make phone calls or send and receive regular SMS text messages? That might indicate that the SIM card is not activated. Have you activated the SIM card in both phones?

If you are getting a pop error on that phone that is a point of purchase error which means it was not scanned out properly at the point of sale.

If you do have a point of purchase error you have to call at&t, provide them with the information on your sales receipt and they can unblock the phone.

the SE is not a 5G phone

@Constructive  the 3rd SE is 5g.