Other
standard connectivity options worked as expected, and the Mi4 even supports USB OTG connectivity, where we could use a 32 GB card and it detected that (though compatibility is with even 64 GB OTG drive), so at least something good when the company hasn't given more than 13 GB user available storage, and no MicroSD card support.
The device packs a
standard suite of
connectivity options, including support for 4G LTE which does
work in the US, and I had no issues with getting high - speed internet on the T - Mobile network.