In the hundreds of eCommerce projects I've participated in, I can say confidently that including a phone number on your website is a very important trust factor. Even if you do not accept orders over the phone, people want to know they are dealing with a legitimate business.

Can you answer the calls if they forward to your cell phone, or even multiple cell phones in sequence? If so, use a service like Grasshopper. http://grasshopper.com/toll-free-numbers-for-ecommerce/ - this allows you to intelligently route calls to different phones until someone picks it up. Or, it can go to voicemail.

If you cannot answer the phone, then I highly recommend at least setting up a professional recording, and returning peoples calls ASAP. You can hire someone from fiverr.com to record a professional voice message.

You should always try to reduce the number of phone calls, by making sure your website includes in-depth information about things such as shipping, taxes, and detailed product descriptions with multiple product photos.

If you'd like to discuss these things in more detail, schedule a call with me and we can dig into it.

Best,