The warning came after it was found that some drivers were placing their mobile phone in a holder and attaching the holder to the steering wheels so as to be able to enter text while driving.
Adul reminded road users that this practice is illegal as the law prohibits using a phone while driving. Any offender will be fined between Bt400 and Bt1,000.
Chatting while driving is considered a distraction as the driver has to look at the phone and use his hand to type.
The law allows the use of handsfree phones for talking only. Cases will be referred to the court, the deputy commissioner said.