However, when I hit the outlier of a T-Mobile iPhone failing to send to T-Mobile Android, that threw a wrench in my network hypothesis. I'm not comfortable making a final judgment with only a single sample (albeit repeatable) in that pairing, so I'd like to get at least one other person with a T-Mobile iPhone that can verify or counter the

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T-Mobile is one of the busiest carriers in the US and part of the ‘big four’ alongside AT&T, Verizon and Sprint. Customers with T-Mobile expect service to be working at all times of the day My laptop's hotspot is not working. - Microsoft® Community Aug 08, 2017