The most professional approach would be to avoid using your personal cellphone, and go for a modern "business phone" solution. Luckily these days the options can be very diverse and inexpensive.
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Think through what you are going to say before you place the call. When men hear the beep, they often freeze up and forget what they wanted to say. If you want to be the go-to guy at work, then you have to exhibit competence on all levels. Don’t spoil your confident image by hemming and hawing and filling your messages with “uhhhhs,” and “ummmms.” If it’s a really important call, consider writing out what you want to say beforehand. If the person picks up, great, you now have some notes to remember what you wanted to talk about. If they don’t answer, you can leave a clear and concise message.
If there are other ways to get in touch with your business, or receive information about your products, you may want to include them in the after hours greeting. Websites and emails are often the most popular forms of alternative contact.