Removing all features from Voip

I need a VoIP landline phone for remote work. It cannot have call waiting, call forwarding, 3 way calling, conferencing or voicemail. I tried to get these removed with an agent but was told they could not be remove form the line. I have read on this forum that these features can be removed. would you be so kind as to remove them from my VoIP line.

Julie WS