When we talk about habits, we say:
‘I always wear my seat belt in case I get into an accident.’
We use ‘in case’ to talk about precautions. ‘If I get into an accident’ would mean that we wait until we have a crash and then put the seat belt on, and ‘when I get into an accident’ would mean that every time we have a crash, which happens quite regularly, we wear a seat belt. We don’t say ‘for the case that’ at all.
I’ll give you my phone number in case you need to call me.
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