How did you get data working on PureTalk?

[bcnaz]

I have a PureTalk sim in the phone. It gets calls and texts, but data doesn't work. I keep getting texts warning me that the 3G is going away; I suspect that is connected to no data.

Settings shows, under Modem Details: 
Carrier PureTalk
Network type LTE
Signal strength 44%
Network Status Registered

Under access points:
Access point name att.mvno

Running Mobian Bookworm on the eMMC.

Any ideas on how to get data working?

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That is a common mistake when "Setting Up"

It should be   Name : Pure Talk  and 
 APN : RESELLER

and if you want to use the 'Hot Spot'
You simply call support and ask for the  Hot Spot option to be 'turned on'