Up to eight smartphones can work with one VEIU device at the same time.  Conversely, more than one VEIU can work with any given smartphone.

VEIU can support multiple users and this therefore allows sharing the same login information.  If one VEIU device is shared by two smartphones for example, when someone rings the doorbell, both phones will receive notification and be able to connect to the call at the same time.  One thing to note, however, is that audio will only transmit between the VEIU device and the smartphone, but not between the two phones.