Image: Skeletor holding up a relatively huge 80s/90s cell phone with an aquatic mutant character name Mer-Man behind him.
Caption: Start every phone call with "my phone is about to die" that way you can hang up on them whenever you want to.
this post was submitted on 15 Apr 2024
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Autism
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But like this I just get SMS that somebody tried to call me without any network disruptions arising from possible handover to GSM if VoLTE doesn't seem preferable by my phone for some reason.
I am trying to think out a TL;DR explanation.
Mobile data is my only internet connection. My carrier only has towers in 1800MHz band but partners with other carrier which has faster network speeds for coverage extension (not load balancing!!). If I get anything else than 1800MHz, I am connected to tower owned by the other carrier, and get much higher speeds. E.g.: 25-40Mbps instead of 0.2-3Mbps.
On Qualcomm there's no way to force specific network bands without root.
I can force it to not use 1800MHz even in area where my carrier has coverage by temporarily blocking the signal by putting my phone into faraday cage for a few seconds. This usually needs trial-and-error as it's made to strongly prefer the carrier-owned towers.
As soon as I take out the phone and see e.g. 2100MHz, I need to keep some traffic flowing 24/7 which won't allow it to switch back to my carrier's towers.
This can be done in 2 ways: Connecting to VPN by using OpenVPN TCP (doesn't work with UDP) or pinging something 24/7 every second in Termux.
As soon as that network traffic stops, the phone tries to switch back to the preffered towers, those owned by my carrier. This may take as little as 5-10 seconds.
VoLTE calls won't disrupt this, but switching to GSM will as it needs to switch towers, and there's no way it's connecting back as I wish. Additionally, it possibly killed some upload/download I had running.
Of course, I can just keep it VoLTE-only, but switching that on takes like 5 seconds when needed, so why not block all calls by default?
About the "Faraday cage": Nothing fancy. Turned off microwave oven is enough. I also took a plastic bag and taped it over with 2 layers of aluminum foil. That also works. Though it still isn't perfect if I wanted to fully block all signals, but that's not the point.
You're WAY overthinking this. Do Not Disturb.