MP4 VOIP phone is a USB phone embedded with memory drive. Once you plug it into the PC, the softphone stored in memory drive will auto run without any additional installation, log in the account automatically, and then you can make VOIP calls freely. The VOIP services provider can use software tools from FreeTalk to make their softphone (such as SKYPE, the NEUF telecommunication etc) into U disk VOIP phone according to their own requirements.