Am i correct that for t-mobile simple choice plan customers have no domestic roaming charges for Calling ? I was travelling in rural areas and i show ATT E pop-up on my iPhone. Does this mean I can still use t-mobile unlimited free calling under simple choice plan because of cross carrier(t-mobile<->AT&T) roaming arrangement ? Any t-mobile web/doc explaining for unlimited calling while roaming similar to data(Domestic data roaming FAQs) available ?
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