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This issue could be caused by a few different factors. Here are some troubleshooting steps you can try to resolve the issue:
Check the volume: Make sure the volume is turned up on both the J3 Luna Pro and the person you are calling.
Restart the phone: Sometimes, restarting the phone can resolve any temporary software glitches that may be causing the issue.
Check the speaker: Make sure the speaker on your J3 Luna Pro is not blocked by any foreign objects, such as a case or screen protector.
Check for software updates: If you are still experiencing the issue after trying the above steps, make sure your J3 Luna Pro is running the latest software update.
Factory reset: If none of the above steps resolve the issue, you may want to try a factory reset of the J3 Luna Pro. Please note that this will erase all data and settings on the phone, so make sure to back up any important information before proceeding.
If none of these steps resolve the issue, it may be a hardware problem and you may need to take the phone to a repair center for further diagnosis and repair.
nano sim
Also from the specs this phone runs on CDMA
CDMA2000 1X 1900/800 band
Whatever network you are thinking of using will need to support cdma2000
https://www.cnet.com/products/samsung-galaxy-j3-luna-pro-sm-s327vl-black-4g-lte-16-gb-cdma-smartphone/specs/
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