Samsung's Galaxy Fold is still undergoing "mass volume testing".

Samsung Galaxy Fold

Samsung Galaxy Fold

The new smartphone's planned April release date was delayed due to screen problem with review units, and the tech giant has remained tight lipped on an official launch for the foldable handset.

Although it's believe the phone could be released next month, there is still much work to be done to ensure customers are happy with their purchase.

The firm's CEO, DJ Koh, told TechRadar: "When those things happen (the issues with the Fold), I try to understand why this happened ... I always make the focus to resolve and even find the root causes [of the issues]."

He added that "at the moment more than 2,000 devices are being tested right now, in all aspects."

Koh continued: "I will say, we defined all the issues, some issues we didn't even think about, but [we found out about them] thanks to our reviewers, [and] mass volume testing is ongoing."

The $1,980 phone was due to be released on April 26, but was forced to push it back after several reviewers reported having damaged screens.

In a statement, Samsung vowed to "thoroughly inspect" the product to find out what is causing the problem.

They said: "A limited number of early Galaxy Fold samples were provided to media for review. We have received a few reports regarding the main display on the samples provided.

"We will thoroughly inspect these units in person to determine the cause of the matter."