Go to your web site on your smart phone – how does your web site look? Happy with it?
There are many companies that can help you ensure your web site looks good when viewed on a mobile device. Do an online search for mobile web sites and you’ll see many services you can pay for or get for free that can “mobilize” your web site.
I use Mobstac and it works quite well.
If you are using a DIY web site service to build your web site ensure your web site is rendered for smartphone and tablet browsers. If the service is not doing it, switch services.