You are correct, but that's future talk. Based on how att is running their network here with far less density compared to tmo and Verizon .. if Sprint can run band 25+band 25 ca combo I think it could work
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Where I go to my parents most of the time LTE is not even available. Evdo is a joke in terms of speed and signal strength and 1X is also just about useless.. So one of the few things should happen if the merger doesn't go through Sprint better find a way to densify their Network across-the-board where they already have service. And or co locate with Verizon which has a majority of the cell sites in the area. Or the other option would be is to actually build their own sites because as it stands with Sprint in my town they wouldn't have even a reliable evdo and 1X Network so Sprint needs to really really densify the entirety of their network here or voice over LTE will be a joke.
It's not about pushing coverage through B26. It's about densifying and making sure you have enough access points that UEs can reach.
The main problem with VoLTE will be existing devices not reaching cell towers. Sprint is notorious for having places where you can get a decent signal and usable DL speeds, but uploads fail (and this is not due to congestion). If you don't have a consistent uplink, VoLTE will fail even with QoS. I sure do hope VoLTE is an opt-in trial while we wait for the merger to close as the network today cannot sustain reliable VoLTE.