Any entrepreneurs out there? The feature that I would most like for my phone (after the caller ID and voicemail features that I have come to rely on) is the ability to block calls from specific numbers and ranges of numbers. Although I can buy a service that allows me to block calls from a single (or possibly several) specific numbers, this is costly and the term is limited. What I most want to do is block all calls from 1-8xx numbers, as well as block calls from any telemarketer/ telephone survey firm that gets past that protection.
The telcos don't seem interested in selling such a service: it would undermine their revenues from these heavy users of their services. I think that the technology for this should be quite doable, however. Wouldn't it be possible to design a phone that did this kind of blocking? I would buy one, and I bet a lot of other people would too.
You can get anti-spam software for your computer. You can ask the post office to not deliver junk mail to your address. Why can't you stop junk calls with your telephone/telephone service?