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If you have checked your bags through all the way to Phuket, then they will not let you take an earlier flight even if there is space. You have to travel on the same plane as your bags - unless they loose them that is.
If you check your bags only to Bangkok, then you have to clear customs and pick them up there. Then you are free to go to the domestic terminal (take the free bus - it is a long walk with luggage) and try to change your ticket for an earlier one. Or you can leave your bags at left luggage (near the domestic departure check in desks) and sample Bangkok for a night.
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