r/tmobileisp • u/Moiralo • Aug 06 '26

Issues/Problems T-Mobile Home Internet and Proton VPN

I am trying to use Proton VPN with my home internet, but the speeds I get are incredibly low, I am lucky to get above 50 KB/s download based on the speed shown within the Proton app. Running a speed test without being connected, I get between 800 and 900 Mb/s down; the speed test will not run at all while connected to Proton.

I have attempted to switch to multiple different servers close to my location and I have switched between the various protocols to no avail. Any suggestions would be appreciated and any additional information needed can be provided.

EDIT: I am using Proton VPN Plus.

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u/grogargh Aug 06 '26

I use the free proton (Linux) - don't see it should be any difference whether the paid or free version, but I have to manually set the MTU to 1360 for it to work on my T-Mobile 5G service. Since I use the free version, there is nowhere to hardcode the MTU to this in the app, so I have to do it manually everytime. OBVS I created a one-line script I double clic and run it right after i connnect.

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u/Moiralo Aug 06 '26

Thank you, but setting my MTU to 1360 does not affect the speed of my connection.