Hi Selvakumar Up is an adverb in your sentences as it is a part of the phrasal verb ring up and tomorrow or his doctor is not its object. Up is a preposition in this sentence: I was walking up the street. Yes, in BrE up is sometimes omitted after ring.
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SelvakumarCan the preposition 'up' be left out in the following sentence?Ring up - also has a different meaning which means to
1. I shall ring you up tomorrow.
2. When is the best time to ring you up?
3. Henry rang up his doctor to find out the results.