The batteries used in Samsung Galaxy Note 7 phones were tested by Samsung Electronics Co.’s lab, as reported by the Morningstar.

This just sets Samsung apart from other smartphone companies like Apple.

In order for companies to be able to sell smartphones at major carriers in the United States, they are required to have their phone batteries tested at one of the 28 labs certified by the U.S. wireless industry’s trade group, the CTIA. This is to ensure that phone manufacturers are complying with the Institute of Electrical and Electronics Engineers’ standards.

According to the CTIA, Samsung is the only manufacturer that is using an in-house battery-testing facility to have their own products tested before they release and sell their phones in the Unites States.

Testing phone batteries has been on the spotlight in the U.S. since the battery issue with the Samsung Galaxy Note 7 started where phone batteries exploded and the company announced a recall on the unit. The recall was then discontinued last week since the replacement units were reported to catch fire as well.

Meanwhile, a spokesman for Samsung said in a statement that their internal testing labs did not reveal any problems in the original and replacement batteries of the Samsung Galaxy Note 7 phones.

Apple Inc., already said that they use third party CTIA-certified labs to test their phone’s batteries.

Lenovo Group Ltd.'s Motorola and Microsoft Corp.'s Nokia have operated CTIA-certified battery labs, though the association says both labs are being closed. Motorola has stated that they used to test their batteries in their own lab but they still use third party labs for the CTIA certification.

On the other hand, Huawei Technologies Co. did not respond on the issue as of this writing.

Samsung said in a statement on Friday that they are planning to make significant changes in its quality assurance processes in line with the Samsung Galaxy Note 7 issue which alarmed the world. However, the company decided not to comment on whether they have plans on using third-party labs to test their phone batteries.