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For the other guy, if you have TMobile cell phone service - you can add a VOIP line for $10 a month plus $40 to 60 one time for their router. Still need plus internet in the office to hook it up. Plus if you want toll free you need to figure that out.
I use T-Mobile, and have the wifi "Hotspot" phone access. We don't use it for our home phone, we still have Comcast for that (since it is almost free in our package) but all of our cell phones run off the wifi signal. All calls made on wifi are free, and you can pick up a hotspot at any free wifi location. Basically, you can use your cell on anytime minutes all day long at places like Panera, McDonalds, etc. And it is only $10 a month. Way better than paying for 4 phones to have unlimited minutes.
Oh, and tell them you want the router free. We've gotten 2 of them without paying a penny.