Some people find that the best companies are those that offer a friendly and knowledgeable telephone support service as well as additional communication via email if necessary. This often means that someone is able to talk through the problems encountered over the phone and find solutions quickly.
Regardless of the communication method, you should also ask the company in what kind of timeframe you can expect a response. Some support services guarantee that you will not have to wait on the phone to speak to someone, whereas others may have average wait time of around ten or fifteen minutes.