Why don't I receive messages on my LG V20?

prafti

    I have an AT&T LG V20 with T-Mobile service. Whenever someone texts me, I don't get the message for a while, sometimes up to 3 hours. And other times, I can get the messages fine. This has been going on ever since I got my LG V20 last April. I know it probably has something to do with the AT&T phone on the T-Mobile service, but when I research everyone says it works perfectly after they put in an APN. Now I have had an APN since late May, but nothing has changed. Does anyone know ANY possible solutions for this problem?

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