One of the best things you can do is make your site call-friendly by hyper-linking the phone number on your website. Make sure you do it clickable.
The tools and solutions which can your website convert better are callback widgets, landing pages and setting up social media. Use your promo numbers for your profiles on every platform where your target group spends time.
Don’t forget about setting up Adwords. Search advertising can be even more effective for inbound calls. For this create different campaigns dedicated for your target groups. You can optimize for them calls with special calls to action.
