When data roaming via China Mobile, getting only EDGE data on iPhone 5s, but LTE on iPhone 6 and 6s

chimerical

    My family and I are T-Mobile users roaming on China Mobile's network. But even though we all have LTE roaming enables on our iPhones, the iPhone 5s only shows EDGE in the carrier bar, whereas the family members with the iPhone 6 and 6s are showing LTE. These are all LTE phones, so why is there a discrepancy?

     

    They all work fine with LTE in the U.S.

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