Here is a very good sales tip or two:
There is only one thing worse than a salesperson entering an interview with a customer and a live mobile phone. That happens to be a salesperson who does not call a client back after making a promise.
In my experience the worst offenders are real estate agents. They cannot live without that cell phone glued to their ear. Every time you see them in their car or in the street that little transmitter is pumping out surperlatives in no uncertain manner.
The very first rule in selling is listening, therefore there is no room for a mobile phone when meeting with a prospect. When you leave that prospect after the interview and another contact is required make certain you contact that person when you said you would. “I will phone you back” is a most common phrase, if you say it and mean it, make certain you do it. Do it when you say you will not a week later like some people.