Phrasal verbs are often used by native speakers in a variety of different settings, so it is crucial the you are aware of and understand them. Learning these and actively using them will make you sound more natural.
Phrasal verbs help to create what is known as a neutral register. A neutral register is most effective for less formal writing – such as exchanging emails with your business associates. If you feel like your business writing style is too academic, or you sound overly formal when speaking, learning and using phrasal verbs will help you in these areas.
You can find an excellent list of phrasal verbs with examples here.