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I think it's because most carriers for some reason don't support VoLTE yet.. so in order to respond to the call, they have to dial back to H+ on the data connection. Some phones' engineering mode can force the cell modem into 4G mode only, but then you won't be able to receive calls anymore. Kinda sucks really. Every modern smartphone supports VoLTE, yet somehow the carriers still don't.
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@Condor LTE? What is LTE? I thought it was only a rumor!?
</sarcasm>
If I rarely have the joy to get LTE, but than VoLTE works, too. But it usually breaks and I'm sent back to GSM after a moment. -
@sbiewald hah, exactly the reverse here 😛 great LTE coverage, but terrible VoLTE. In fact I've never seen any of my phones show VoLTE support anywhere.. that's legit something that I'd call a rumour 😅
How not to design a modem...
Cables hide perfectly - inside the wall...
After moving, I don't have DSL yet so I have to use mobile data to get internet access. Additionally I had to finish a freelancing job. In Germany you have one of the most expensive and least reliable mobile networks in europe.
I had to upload my develpoed software to a remote server
So I suddenly was sent back in time. A single call would have disrupted the download (I can't use internet and phone at the same time, might be a phone issue). While my phone has "high speed" volume left and showed at least HSPA, but I still, the upload rate was prehistoric:
rant
telefonica
mobile network
modem