Can I transfer my visa to a new passport at Phuket Immigration after collecting it from the South African embassy in Bangkok?

Yes, after collecting your new passport from the South African embassy in Bangkok, you can go to Phuket Immigration to transfer your visa. The embassy will provide necessary forms which you need to fill out. However, it's important to note that while visas can't be transferred, you can transfer an Extension of Stay. Valid documentation and both old and new passports will be required at the immigration office.