Yesterday Mr Suthep issued a call, in which he said, in part, “I ask my brothers and sisters to help, especially those using AIS: Regardless of its quality, return the SIM cards and use other brands."
Doing this, he added, would deny exiled former PM Thaksin Shinawatra and his family any revenue from the company.
Today, however, AIS broadcast its own message: "AIS would like to affirm that the company does not involve in any political affair or issues.
"Dr Thaskin Shinawatra & Family have sold out all the shares in the company group since Jan 23, 2006, and have not been involved with the company since then in any regards.
"Thanks you for your understanding and continuous support."
In 2006, Mr Thaksin and his family sold their 49.6 per cent of AIS to Singapore government investment arm Temasek, in a B55 billion deal that caused a furore in Thailand when it was learned that no tax was payable on the sale.
It gave no indication of how many of Mr Suthep's supporters might have followed his call.