In November last year, the 73-year-old was diagnosed as having laryngeal dystonia, a condition where the muscles around the voice box spasm.
Doctors then started performing the pioneering procedure of injecting botox, more commonly used by doctors to smooth out facial wrinkles, into her voice box.
Phyllis was overcome with emotion as she gradually regained the ability to speak.
"I was getting so frustrated. I kept passing out with tears falling down my face because I couldn't ask for a cup of tea or anything. Now I've got a lot to catch up on. I'm putting my husband in his place," News.com.au quoted Phyllis, as saying.
Phyllis, who lives in Suffolk with her husband George, said that was delighted after being able to finally talk to her granddaughters, Donna, 13, and Leanne, 11, for the first time.
"I couldn't speak when my granddaughters were born, now finally I can tell them that I love them," she said.