If your internet connection can handle Netflix or Facebook, your internet is probably fast enough for VoIP. According to the FCC, VoIP calls require internet speeds that have less than 0.5 Mbps download.
That’s very low! To put that number in context, streaming video uses internet speeds that are at least six times that, with recommendations at 3 to 4 Mbps download speed. Social media also uses more internet capacity than VoIP at 1Mbps download.