Exactly. This just isn't a Sprint issue....it's a CDMA issue.
Actually is your carrier's fault for making poor decisions.
The reason your old phones are working well is that they a) had two radios in them and b) were not "spark" only phones.
The choice to go to sell a spark only device when the carrier hasn't fully implemented a full roll out of spark antennas nation wide is now hurting their consumers like you. Add in that yes, maybe a software update or firmware fix for the radio might just help with any issue with VoLTE or connection in general, if you aren't on a spark network you are going to have trouble no matter what.
Also, the fact that Sprint still has old legacy antennas in most places yet has minimal Spark roll out even in the best spark locations means that your battery life will suffer as well as give you other issues.
I loved Sprint's network where I live years ago prior to wimax. Once wimax came, it was a slow roll out at best and I'm in Sprint's best location for service reliability bar none, nation wide. So if wimax sucked by me, they were far worse elsewhere. But the service only got worse again once the original LTE on Sprint came out because now Sprint's roll out was once again way to slow. The older wimax phones couldn't use the spectrum so Sprint kept as much wimax alive as they could while rolling out the LTE band antennas. But plenty still lost wimax due to there is only so much room on an antenna for all the different antennas. Also at the same time, plenty of people never got wimax at all because they were too low of a priority and LTE came instead later giving them no relief. And now with Spark deep in its roll out, you would think that Sprint would learn to not FORCE Samsung to only build a device with one new and improved radio without finishing it's roll out of Spark.
(I'm sure that I'm missing a few pieces of the puzzle when it comes to the story of Sprint's demise over the past 5 years but I moved on and I'm now on AT&T)
I don't expect the typical consumer to know or understand how cheep and thoughtless Sprint can be for their survival in the world of wireless. How repeated poor decisions have hurt not only the company but it's consumers who with poor understanding stay on such a lousy network.
VoLTE is still new for Sprint and sure such issues tied to it will be fixed. But to force their customers to deal with such issues when they could have put an older radio inside the S6 besides the Spark one and you'll solve almost all your issues without such a software update is insulting to your user base.
Verizon issues are different than yours and far less than yours, regardless that they are in the same boat. That's because they already fully rolled out the proper antennas and now might just have to tweak their firmware and fix a bug or two. Sprint? Yeah, after the mass firings I won't hold my breath that they will improve their coverage. But the time they are done with Spark, they will start selling phones that require a whole new antenna system and the same BS will start again.
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