A Thai rapper said he would not be silenced on Thursday after he received messages from Apple warning that hackers could be targeting his phone.

Apple warned the rapper and five other Thai activists that, if successful, the hackers could remotely access their data and even the camera and microphone on their iPhones.

Dechathorn "Hockhacker" Bamrungmuang, from the Rap Against Dictatorship group, posted a screen grab of the message to his Facebook page late Wednesday.

"Apple believes you are being targeted by state-sponsored attackers who are trying to remotely compromise the iPhone associated with your Apple ID," the message warned.

"These attackers are likely targeting you individually because of who you are or what you do."

Dechathorn, who has previously been arrested for sedition but was later released, said he was "appalled" by the hacking attempt.

"We (Rap Against Dictatorship) will probably write a song about this," Dechathorn told AFP.

Rap Against Dictatorship took a high-profile role in the youth-led protests that shook Bangkok last year, demanding the resignation of Prime Minister Prayut Chan-o-cha.

Asked about the messages from Apple, the deputy secretary-general to the prime minister said: "If it is authentic, the Digital Economy and Society Ministry will look into this."