NEXTIVA has the worst customer service I have encountered in business telephones in many years of business. Every issue is shunted to off-shore call centers and reps that can't problem-solve anything. There is no way to elevate questions to a supervisor, and no way to talk to a person of knowledge/intelligence to address a problem. Porting services (my main issue) are a nightmare. Its hard to get into Nextiva, but next to impossible to get out(!). Prepare yourself to waste multiple business days of staff time trying to deal with incompetent and uncooperative "Amazing" support people who run you in circles. If you are thinking of NEXTIVA, I suggest you THINK AGAIN.