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The Samsung Galaxy A40 was released in April 2019.

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Why is my camera not working and my phone is not receiving sim signal

My phone's camera is not focusing, and my phone doesn't have a steady network connection, almost non-existent.

Please, my phone is a Samsung a30

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? Has it sustained damage? Exposed to liquid?

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NO. I had the screen changed.

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@carlmag if the screen has been changed I'd open it up again and check the connection for the camera and definitely the coax for the signal. The coax connector can be a pain to seat as they are tiny and can look like it's on when it's not.

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martin ginkas crwdns2934231:0crwdne2934231:0
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