Yeah, I don't see anything wrong with your communication. I usually make first contact by phone and then switch to email for the updates and finer details.
Judging from the responses, preferred method of communication varies with each business. Personally, I will very seldom answer the phone but then again, I don't have a business phone, I carry a phone my full time job pays for. I am allowed to use it for personal business but I try to keep it to a minimum. Plus I work odd hours so I may be active when others are not and unavailable when most are.
That being said, I reach out a lot via email, facebook, or PM and do have issues where I don't get a response. As much as I hate to pick up a phone, it usually means that I have encountered one of those people who prefers the phone and then I get great results.