The dual-screen smartphone took a leap forward recently with the introduction of the Yotaphone, which has a standard touchscreen on the front, and an e-paper display on the back.

Samsung's Galaxy S9 has only been on sale for a week, but stories of touch-screen problems are popping up already.

The point of action here is a patent for "Snap Back", a feature which informs a user on a touch-screen device that they've reached the end of a document – Samsung says that it wasn't Apple, but ...

If your Samsung Galaxy S9 touch screen is not working, you can try force restarting it. This will not erase any of your data, but it will power cycle the device and may resolve the issue.

Samsung is attempting to patent a dual touch-sensor device – such as a tablet or large smartphone – where both the screen up front and the back of the unit respond to touch and gestures.

Although the phones have only just been released, a number of Samsung Galaxy S9 and S9 Plus owners are reporting that they're experiencing touchscreen issues with their new handsets ...