Local server. Easy to use website, payment and setup. 1.5 cents per min
Using CSipSimple for Android on T-Mobile 4G $30 5gig data plan.
I get 100 cellular voice calls included in my cell plan and have the option of not taking the call then call back using voip.ms. Passes my phone number to caller ID so people think I am returning their missed call.
Some times people can't tell the difference. Some times they can.
Douglasville,Douglas,GA
Contract price not specified. 
"Low latency, selection of servers, low price"
"Bad for T-Mobile"
"VoIP on T-Mobile 4G Satisfactory"
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