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Unfortunately, because the JCA374 requires a phone, tablet, computer that supports DP alt-mode in order to work properly with the HDMI and the Samsung A21 does not support such feature, this device in particular will not work for you. If you wish to simply mirror the phone screen onto the TV with your Samsung phone, we recommend the JUA165C and once you download the display app required onto your phone, you will see your phone screen on the TV. Depending on what type of Android version you have, we may even be able to recommend a wireless display adapter. ** Feel free to contact the Technical Support team on the packaging if you require further assistance or if you have any other questions and someone will be glad to assist.
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