Samsung S8 with RW GSM SIM Connected to Sprint Tower

This caught me by surprise:

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From a technical standpoint, there’s nothing to prevent LTE roaming across T-Mobile’s and Sprint’s networks. T-Mobile’s and Sprint’s networks use mutually incompatible fallback technologies, so roaming would be limited to LTE.

T-Mobile’s “Roamahome” allows for those on Sprint’s network to roam on T-Mobile’s LTE bands. I hadn’t heard the ability had been extended for phones on T-Mobile’s network to roam on Sprint’s LTE bands or that any such capability had been extended to customers of MVNOs.

There’s one spot in my area where my GSM configured phone is regularly on B25. I don’t know if it is nationwide but they’ve opened up Sprint LTE to T-Mobile configured phones in my area.

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