For now though, the only plus of LTE is higher upload speeds and less spectrum usage...single channel HSPA+ is slower these days and DC-H+, while faster on the downlink, uses twice the spectrum.
Dual stack IPv4/IPv6 rather than a v6 only PDP context (which T-Mo is limited to on the UMTS side). Also fewer hacks on the network side of things (Eg. proxies).
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