No Speaker phones: Do not be on a speaker phone. Because speaker phones are such poor quality Dr. Wallach may not be able to hear you and it may result in your call being dropped.
Have a pen and paper handy to write down the products he recommends. You don't have to write down all of the details. You can get many of them on this site. Also, if you are a podcast subscriber you can listen to your conversation over and over at your convenience.