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Hello, We understand how frustrating it is when the touchscreen of the phone is not responding correctly.
There are some simple ways to get the touchscreen working again when it’s frozen, unresponsive, or acting funny. Here are some troubleshooting steps to assist you with your phone touchscreen issues https://www.samsung.com/us/support/troubleshooting/TSG01213974/.
If the issue persists after performing the steps, you can use the following link to find a list of service centers in the U.S. that can do the repair: http://www.samsung.com/us/support/service/location or by contacting customer support at 1-800-726-7864.
For service outside the U.S., please use this link: https://www.samsung.com/us/common/visitlocationsite.html
Be sure to click " ✓ Accept as Solution" when you find an answer that works for you.
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Another thing is have you recently dropped your phone? You could have damaged the screen itself even if there is no sign of screen damage.