SEOUL (Reuters) - Samsung Electronics Co Ltd <005930.KS> said on Monday it is investigating reports of heat damage issues on new Galaxy Note 7 devices after U.S. carrier AT&T Inc <T.N> said it would stop exchanging the device to customers.

"If we determine a product safety issue exists, Samsung will take immediate steps approved by the CPSC to resolve the situation," Samsung told Reuters in a statement.

A Southwest Airline plane was evacuated last week after a Note 7 phone began smoking inside the plane. The family that owned the device said the phone was a replacement device that Samsung has said uses safe batteries.

(Reporting by Se Young Lee; Editing by Stephen Coates)