Yes. You can use multiple phones with Vonage service by using multiple jack extensions, cordless phones with extra handsets, wireless phone jacks. Keep in mind that Vonage recommends you do not connect more than five phones to a single Vonage phone line.
In addition, there is Vonage Extension App which allows you to use up to three smartphones with your Vonage phone service. The app can be used with all Vonage calling plans.
