I 2nd that
there is a small thai restaurant near the very old mall on the circle in phuket town heading towards the Closed Robinson on the right<
best chicken, red pork, moo gorp and rice on the island
been eating there 30 + years
its now up to 80 baht for the dish & a coke!!!
another good one is in Kamala, main road "duck spicy" across from the 7/11 at the intersection
excellent Thai food ( not watered down for farnags) at thai prices