Grasshopper is a lightweight, cloud-based phone system that is easy to setup and can work with your existing cell phone or office phone system. Plans start at $12 per month and $0.06 per minute with unlimited extensions.*
RingCentral is also popular choice for real estate professionals. Plans start at $25 per month per user.*
* Pricing accurate as of time of publication. Tenant Turner has no affiliation with either service.