The Galaxy Fold, Samsung's first foldable phone, is reportedly already having screen problems. It doesn't go on sale in the US until April 26, but some review units have reportedly broken after just a few days of use.

Bloomberg's Mark Gruman tweeted on Wednesday that the interior, folding screen of his Galaxy Fold review unit was "completely broken and unusable" after two days.

Gurman went on to say the problem may have been caused in part by removing a layer of film.

"The phone comes with this protective layer/film. Samsung says you are not supposed to remove it," he tweeted.  "I removed it, not knowing you're not supposed to (consumers won't know either). It appeared removable in the left corner, so I took it off. I believe this contributed to the problem."

YouTuber Marques Brownlee also took to Twitter to warn against removing the film. 

"PSA: There's a layer that appears to be a screen protector on the Galaxy Fold's display. It's NOT a screen protector. Do NOT remove it," he wrote, along with an image showing how he'd tried to take off the layer. "I got this far peeling it off before the display spazzed and blacked out. Started over with a replacement."

Samsung says its phone "is manufactured with a special protective layer," to cover the plastic Infinity Flex display. "It is not a screen protector – do not attempt to remove it," Samsung says.

CNET has been handling and reviewing the Galaxy Fold since Monday but hasn't experienced any such screen issues. We didn't remove the protective layer.

The $1,980 phone has two screens: a 4.6-inch one on the exterior that looks like a typical smartphone screen, and a second, folding screen on the interior that opens up to create a 7.3-inch display. It's one of a number of foldable phones set to come on the market from manufacturers including Huawei and Motorola.

The Verge's Dieter Bohn also reported that the screen on his Galaxy Fold review unit broke after two days of normal use. A small bulge reportedly developed near the crease of the Galaxy Fold, eventually breaking the screen.

Samsung didn't immediately respond to a request for comment.

First published April 17 at 11:54 a.m. PT.
Update, 12:38 p.m.: Adds tweet from Marques Brownlee.