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If you want to apply the protection on the back as well as the front side of your phone, you should check out this case. It costs around $22, and you are getting two pieces to protect the whole phone. It is available in black and pink, but the black one looks better than the other one.
Buy for Note20 : Amazon
Buy for Note20 Ultra : Amazon
It is made of multi-layered TPU and Polycarbonate materials so that it can offer better protection. Like other cases, you can use all the wireless functionalities such as wireless charging, Samsung Pay, etc. even after installing this case.