Internet Service Provision
Daniel Kapusta notes an impediment to his purchasing a HipTop or Treo:
My phone number is the killer feature of my phone. I've had the same mobile number for about 5 years, and I'm not letting go.The lack of number portability is a sticky feature; it enhances customer retention. E-mail addresses are the same way, which is why it behooves one to purchase a domain, or use an address that is not dependent on your access provider.