Being a drivers mate doing multi drop

Flow:
Hi looking for advice I have just started a new job doing multi drop and have been told to not put my card in slot two like I have in every other job because as a passanger I will be making phone calls and doing other work and the tacho would record it as poa and that would be wrong so I have to do manual entries to show my activitys for the day is this right

where does he say 3 in cab?..

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