I usually use the "tell me" on calls. For example when I pick up call I like to answer in this way: "Yes John, tell me"
Is it a good practice to talk on call in this way?
closed as primarily opinion-based by Kristina Lopez, tchrist, Mitch, Andrew Leach♦, MετάEd Jun 26 '13 at 13:18
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It depends what effect you're trying to get and whether it's getting you that effect. Most likely, it's just annoying people -- particularly people you speak to often.
Using a non-standard reply where courtesy demands a standard one forces the listener to try to figure out whether you meant something special, distracting them from the flow of the conversation. While they're trying to figure out what it is you are asking them to tell you, they're probably losing the thought of what they wanted to tell you.