[MacsHeadroom]

So talk using VoIP over 3g/4g and have unlimited minutes.

T-Mobile will not throttle until at least 5GB. In my experience they just don't throttle at all though.

[mahyarm]

VoIP for me over 3G tends to be not nearly as stable as an actual phone call.

[selectodude]

I think the plan works over LTE, which would make it a much more tenable position once T-Mobile's LTE rollout is a bit more fleshed out.