Wow, the T-Mobile LTE signal repeater actually works.
Went from -117dBm to -86dBm.
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I'm using the Network Cell Info app and it looks like I'm piggybacking on someone's T-Mobile CellSpot broadcast five blocks from me. The closest T-Mobile cell tower is about 1.5 miles away at a high school.
Current speeds in my house on T-Mobile. On Verizon I only got 30 Mbps up/down.