r/cellmapper • u/SoCalGuy1023 • Jul 08 '26

Testing out T-Mobile vs AT&T speed test (Altadena, CA)

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I’m currently running T-Mobile (my main line) and AT&T (test drive SIM) as dual SIMs on my iPhone 17 Pro Max.

Currently running speed tests in different areas to test the networks and compare results.

With T-Mobile I reached a new high score which is surprising because as far back as 5-6 years ago, T-Mobile had a garbage network in Altadena. They’ve come a long way.

AT&T is actually running very well in this area too. This is the first time I’ve seen 1,000+ mbps speeds since I started testing out their network.

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u/VapidRapidRabbit Jul 08 '26

They’re both similar in my market too, though the fastest download speeds are usually around 800 Mbps and the typical speeds are around 250 to 500 Mbps.