Vodafone has set up "a number of taskforce teams" to try to fix network problems following a class action legal threat in which about 9000 customers have expressed an interest in joining.

Sydney law firm PiperAlderman last month sought disgruntled Vodafone customers to press a class action over dropped calls, bad reception and poor data performance.

Today it posted an update on its site saying that approximately 9000 Vodafone customers had registered their interest.

"In the next five to ten business days, we will be sending group members a request for further information relating to their specific circumstances," it said. "Upon receipt of this information, we will process it and take the matter forward."

Vodafone has faced customer backlash over thousands experiencing poor service over the past few months.