Instead of relying on web pages that are not formatted for every type of device, I have been relying on .TEL domains for more than a year, and with no intentions on dropping the ones that will serve purpose. The reason I chosen .TEL domains is simple and that would be the design, and purpose of .TEL. To understand this purpose – one has to know what, and a .TEL works.
When you go to a .TEL domain, you are getting content directly from a DNS server. Therefore, if you put a phone number in the .TEL domain, you are placing that phone number in a particular DNS record. When a device visits the page, the server defines what type of web browser it is, and then acquires a particular template that is intended for that browser with code that pulls the appropriate DNS information and insert into the page.
This however, requires specialize coding which in this case will mean that you would not need a hosting account for the .TEL domain. The domain is hosted by the registry authority which is TelNIC. Since they control the DNS records, and the hosting, this is an all in one package. Very rarely do you pay a reasonable price for a domain and get the hosting.
This however means a limited means of content. In the case of .TEL domains, this is fine, and expected. The idea of a .TEL domain is to provide contact information. It is not intended to run a blog, or other web site. In addition, there are no directories, but everything is organized in sub domains. For example, I have http://fsp.tel which is my personal contact directory. I also have http://phone.fsp.tel. If for some reason, I had my Android phone, and a Blackberry (most likely would be a 9700), then you might see http://g2x.phone.fsp.tel which may give you all of the contact information regarding my Android phone while http://9700.phone.fsp.tel will have relevant information regarding the 9700. You would most likely see only 1 level deep with sub-domains at least for me.