Make sure you’re at the „starting point“ early, because they drive you to the busstop in a minivan. Van left at 9.20, transit worked out fine for me. The actual bus ride is only 370, so quite a price to pay 330 for a 15 minute van ride. The main critique tho is that the bus did not stop at the shown bus stop in Phuket Town but rather 4km outside of town. Had to take a taxi for 200B to get to the actual stop. Ridiculous. Sadly the only option to get from Chumphon to Phuket (if you don’t want to spend 7000B for a taxi). Would not recommend.