RAvirani

That must be a configuration error. Those LTE carriers are adjacent and should be combined into a 10x10 carrier centered at EARFCN 8640. It may be a good idea to reach out to someone at Sprint about this.

Email marci@sprint.com with all of the technical details. Your email will get forwarded to a network engineer.

The Sprint LTE network throughout Oregon is VERY well optimized. I wish Sprint's network team was that good everywhere. The bug is likely a Samsung bug. It may be a good idea to reach out to someone at Sprint and inform them of it.

I double checked and your phone should utilize SRLTE at all times when LTE roaming (I believe even when the LTE and CDMA provider's are the same although I'm not 100% sure). There may be a software/config bug if your phone isn't. Does toggling airplane mode in the roaming area cause SRLTE to turn on?

What do you mean a VoLTE enabled area? I thought you were roaming... I'm confused what you mean here...

Interesting. I haven't had issues dropping from T-Mobile LTE to USCC CDMA to recurve/make calls on my iPhone. I believe they using SRLTE, not eCSFB, though... Did the problem persist if you disabled VoLTE?

Found my first two M-MIMO sites in the area: SE03XC104 (located by Wild Waves in Federal Way) and SE03XC278. They are both broadcasting five L2500 carriers.

Sprint's plan is to deploy standalone NR with EN-DC, as they don't suffer from the same uplink issues mmWave deployments do. This is effectively an NR PCC aggregated with LTE SCCs. That being said, I don't know if we'll see SA or NSA NR for the initial launch. Judging from the upload speeds in the screenshots I've seen on various Sprint engineers twitters', I doubt the initial launch will be SA NR...

Verizon's NR deployment is NSA (non-standalone). They are using LTE for uplink. Think of it as an LTE PCC aggregated with a downlink-only NR SCC.

The roaming agreement with T-Mobile includes LTE data only, not VoLTE. Handover of a Calling Plus call is possible and has been documented, I believe. That being said, latency is often problematic as roaming traffic is always routed back through Sprint's network. VoLTE calls are trickier. They can be handed off to a similar-to-Calling-Plus data session on T-Mobile LTE, although they would face the same latency issue. I'm not sure if this has been documented yet. A side note: my iPhone 8 often drops to CDMA for a few seconds before kicking over to T-Mobile LTE, making a smooth handoff impossible, although I've witnessed iPhone X and newer devices transitioning directly from weak Sprint LTE to T-Mobile LTE. A handoff may be possible in these cases.

Sprint has enabled EN-DC on their NR network. N2500 will be aggregated with L2500 from launch day. VoNR will be deployed, although I don't know if it will be live on launch day.

Take a look at the official four launch cities. 5G coverage is displayed there.

Sprint updated their coverage map today. It looks like the public map is now displaying 5G coverage!

These were the next devices planned for VoLTE launch on Sprint.

Pixel 3/3XL/3a/3aXL are all VoLTE-capable on Sprint.

Happy to help!

If you update your phone through iTunes on your computer, iTunes should download the latest carrier bundle. I'm not sure exactly which folder it gets stored in on Macs as I have a PC, but you could probably figure it out if you dig around a bit. If you can't find the carrier bundle, I believe Apple maintains a website with all signed carrier bundles as well... Once you have the bundle (which should be a .ipcc file), add a .zip extension to it. You should then be able to extract the files in the bundle. In the Payload folder, the file called carrier.plist has all of the juicy stuff you want. The best way to poke around or edit this file on a Mac is probably to use Apple's Property List Editor. If make changes to the bundle and want to load the updated one onto your phone, you can do so through iTunes. Open terminal and navigate to the /Applications/Utilities/ folder. Then run the following command: defaults write com.apple.iTunes carrier-testing -bool YES This will launch iTunes in carrier testing mode. You can now option-click (or shift-click on Windows) the Check for Update button when your phone is connected to your computer. This will allow you to pick a .ipcc file to load onto your phone.

Yes, in fact you can edit them and reload them onto your phone. Do you have a Mac or PC with iTunes?

Carrier settings sometimes update automatically. If you navigate to Settings>General>About and hover there for a few seconds, your phone should prompt you to update your carrier package if a new one is available. You may receive a popup asking you to update your carrier settings out of the blue if a high priority update is issued.

Yes. Canada is primary in that region and thus Sprint only has enough spectrum for 3x3 L800.

Hard to say. There isn't much duplex spacing so I'd say possibly although not certainly. I wouldn't be surprised if the lower and upper part of the T-band were FDD and there were non-paired chunks of spectrum inbetween. This is how the lower 700 MHz band is set up. For those unfamiliar, see here: I'm not sure if Sprint will be able to pick up spectrum here. Maybe someone else more knowledgeable can chime in here. SoLINC operates directly below Sprint, in the expansion band. Their 1.4 MHz LTE carrier is centered at 816.6/861.6 MHz. If they are interested in acquiring licenses, it will only be in their limited coverage area. As of today, they haven't made any public statements regarding acquiring spectrum.

It might be worth it to reach out to the network team in that area.

Those two carriers are contiguous. They should be merged into a single 10x10 L1900 carrier. Not sure why they haven't been.

That is likely a configuration error and will hopefully be fixed soon. There are no advantages to running two adjacent 5x5 L1900 carriers. They should broadcast a single 10x10 L1900 carrier with EARFCN 8640/26640.

8615 is pretty much always 15x15 L1900 on Sprint. The only other thing it could be is a 5x5 LTE carrier in the PCS C5 block, which should never exist. This is because if Sprint owned the PCS C5 block then they would broadcast a 10x10 C5+G carrier with EARFCN 8640.