@lisa44086 "The only other thing to mention, whether it's relevant, is that the phone had fallen in the toilet months ago" its definitely quite relevant. Look at what you needed to do to get it to charge.
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For now let's assume this has nothing to do with AT&T. The issue that you are describing sounds like an issue either with the battery itself or with the charging circuitry of your phone. You do want to go ahead and start by replacing the battery with a new one. Use something like [https://www.youtube.com/watch?v=aHxddDj1e0I|this video]
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For now let's assume this has nothing to do with AT&T. The issue that you are describing sounds like an issue either with the battery itself or with the charging circuitry of your phone. You do want to go ahead and start by replacing the battery with a new one. Use something like [link|https://www.nadiemellamagallina.com/en/manuales/smartphones-1/samsung-4/samsung-galaxy-a71-1204/bater-a-10710|this guide] to work on it. It was written in French but a browser like Edge of Chrome will translate it just fine.
Now it's time to take it apart and change the battery and the charging board. Use something like this guide [guide|145854] to do that. While you have your phone disassembled, take a look at the boards as well as the flex cables. Check for corrosion, tears and any other damage. These models have issues with the flex cable from the charging board to the mainboard. Consider replacing it.
@lisa44086 "The only other thing to mention, whether it's relevant, is that the phone had fallen in the toilet months ago" its definitely quite relevant. Look at what you needed to do to get it to charge.
For now let's assume this has nothing to do with AT&T. The issue that you are describing sounds like an issue either with the battery itself or with the charging circuitry of your phone. You do want to go ahead and start by replacing the battery with a new one. Use something like [https://www.youtube.com/watch?v=aHxddDj1e0I|this video]
Now it's time to take it apart and change the battery and the charging board. Use something like this guide [guide|145854] to do that. While you have your phone disassembled, take a look at the boards as well as the flex cables. Check for corrosion, tears and any other damage. These models have issues with the flex cable from the charging board to the mainboard. Consider replacing it.
[guide|21499]