In the best of brick and mortar stores, assistants are readily available to help answer customer's questions in order to help them make a purchase.

Think about the times when you've walked through a store and store assistants could be easily spotted so that you could ask for help - as opposed to the times you've walked through a store and weren't able to find anyone and became irritated and frustrated. Possibly even giving up on what you were looking for.

Your visitors may have a quick question that they need to ask in order to close a sale.

Be easily accessible to your visitors by prominently displaying your toll-free phone number to the top of every page.

Correct example: