Based on observing, listening to, receiving, and placing thousands of sales calls, Art Sobczak put together a list of the Top 10 Errors Made by Sales people When Using the Phone. The list details the most heinous, avoidable errors sales reps commit every day; Mis-cues that sabotage their sales efforts. Read through the errors and then pay particular attention to Action Steps. This is what you can do to avoid the errors. Follow the advice, and be more effective.