While organic search has the advantage of being free and can be influenced by your website content, it is limited to the number of people searching for your business or the products and services you offer. Paid search advertising allows you to reach a broader target audience which has more potential customers who may not be aware of your business, all while providing you full control over your messaging and costs.
Good question, for most directories I use they ask for mobile number to send a message of verification, for the ones which phone you for verification inform the company before hand to tell their customer service people to be ready. I know the bigger the company the more tricky these things get you just have to find out what works best to answer the calls even if they give you a direct number to use.
BrightEdge research supports that a blended approach is best for delivering high performing content. Not only will combining organic and paid search increase website traffic, but it will offer a bigger return on the investment. Take Retail, Technology and Hospitality industries, for example — organic and paid search combined make up more than two-thirds of their total revenue.