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The Samsung Galaxy A30S is a phone released by Samsung in August of 2019. It came with Android 9.0

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My phones network doesn't work properly

When i place in my simcard it can only read when it comes to major towns and cities only, past that it doesn't work.

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Has the phone been dropped or been opened? Check the coaxial connections on the motherboard and daughter board.

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Yes...it fell in the pool, i tried fixing it but cameback with the network problem.

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Hi @mugs

Since it has been in water (you never mentioned this at first) that changes what to look for.

The impurities in the water causes corrosion and provides circuit paths for the electricity which were not in the phone's operating design and could damage the components. The corrosion starts immediately and is ongoing until it is completely cleaned away

First do not try to charge or to turn on your phone and then remove the battery as soon as possible from the phone to minimize any further damage.

Then you need to dis-assemble the rest of the phone and clean all the affected parts using Isopropyl Alcohol 99%+ (available at electronics parts stores) to remove all traces of corrosion and water. If possible do not use "rubbing alcohol" as in some cases this is only 70% IPA or less, can contain additives and is not as effective. If you do have to use it check the label to verify the amount of IPA. The higher the percentage of IPA the better

Here is a link that describes the process. Electronics Water Damage

As always with electronics, especially surface mounted pcb be gentle when handling and especially when brushing away the corrosion. You do not want to remove any components from the board. Remove the shields that may be covering some components as the water may have got in under there. The ends of any flex cables and their connectors need to be cleaned as well

Hopefully after you have done all this the phone might possibly work correctly again.

Here is a link to a teardown video for the phone that may help.

If this process seems too daunting, take your phone to a reputable, professional phone repair service, experienced in liquid damage repair and ask for a quote for a repair. If you decide to do this, do it sooner than later.

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Jayeff where do you copy all this from?

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@strongbow

It is my own view of how to fix water damage based on years of experience working with electronics (admittedly not mobile phones but to me essentially the problem is the same for all electronic devices affected by liquids).

The links (besides ifixit guides, wikis etc on this website,) are found by searching online for manuals, videos etc that will help the OP to hopefully repair the device by knowing how to dis-assemble etc.

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Adriana dwayne будет вечно благодарен.
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