I can't get SIM/carrier internet, only Wifi

[Lcmv]

I bought a used phone from a repair shop. Nice guys, great service, but I trust no one so I wiped and reset the phone back to factory settings as soon as I got home. It's a Motorola and it has Android 10. It's been sitting on a desk for a few days with Wifi access only.

Today, I tried two SIM cards in it for the first time. They seem to be detected and their respective carrier names are displayed. But I can't use their internet.

I have two other phones here. The two SIM cards work on them, I can get internet on them and the other phones. But they fail to get internet on the Motorola/Android 10.

I am of course very inclined to going back to the shop where I bought the phone and claiming it is defective. Unless you people have some great wisdom to share that will solve the problem. Do you?

Thanks for any help.

 

[B. Diddy]

Make sure the APN settings are correct for your carrier. What is an APN, and how do I change it? | Android Central

 

[Lcmv]

Make sure the APN settings are correct for your carrier. What is an APN, and how do I change it? | Android Central

When I open that section, I see an APN with the name of the carrier. I guess it's put that automatically by the SIM.

When I put the SIM in another phone and open that section, I see the exact same APN as the one shown in the "bad" phone.

 

[B. Diddy]

Which Moto phones do you have? Are they 5G capable or only 4G LTE?

If 5G, make sure you're using the ENHANCEDPHONE settings. If only 4G LTE, use the NXTGENPHONE settings. https://www.att.com/support/article/wireless/KM1062162/

 

[Alice- Bennett]

Reset APN to default and set date/time on auto. If still no data, switch the sim slots.