If I was to have my own phone service, and able to do all I would want to do, then my plan will diminish the role of the SIP provider to just one number. The plan will look as follows:
$25 – 4G Plan
$10 – Toll-Free VOIP Line.
$10 – Caller ID+
$5 – Incoming Number (eFax, and voicemail)
$5 – Send Fax
$55 – Total
I currently have a cellular phone line, and another service provider for my voicemail, and international numbers. With this plan, I can consolidate everything into one service, and therefore only one company to deal with rather than 2-3 companies.