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T-Mobile Just Ripped 8 Million Customers Off Their Grandfathered Plans – and Raised Their Bills
(www.gadgetreview.com)
This is a most excellent place for technology news and articles.
Switched to an MVNO and have been quite happy with it. Cut bill by almost 2/3.
MVNOs do have a lower data priority than the parent network, but IME this hasn't made much difference. I don't tend to stream a lot of video on my phone though, so it might be a concern if you need fast data.