Example: The Opposition party CALLED FOR the minister's resignation after the scandal broke.
Meaning: Go to collect something
Example: The courier CALLED FOR your parcel, but I told him it wasn't ready yet.
Meaning: Telephone for something
Example: I'll CALL FOR a cab right away.
Meaning: Go and collect someone to take them out
Example: I'll CALL FOR you at seven, so be ready because the film starts at half past.
Example: An emergency like this CALLS FOR some pretty drastic action.