VoLTE issue on op3? - OnePlus 3 Questions & Answers

I am using Vodafone in sim1 & jio in sim2.
Everything was working fine, until i removed jio sim & inserted airtel sim in sim2 just to check airtel sim active or inactive.
But after switching back to jio sim, now volte is not working for jio.
i tried switching jio sim in either slots but same issue?
any help please?

parag60288 said:
I am using Vodafone in sim1 & jio in sim2.
Everything was working fine, until i removed jio sim & inserted airtel sim in sim2 just to check airtel sim active or inactive.
But after switching back to jio sim, now volte is not working for jio.
i tried switching jio sim in either slots but same issue?
any help please?
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Dial*#*#4636#*#* and check in Phone Information if the switch for Volte is enabled. Reboot and try the sim.

tnsmani said:
Dial*#*#4636#*#* and check in Phone Information if the switch for Volte is enabled. Reboot and try the sim.
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I tried that as well.
Apparently i had to flash OOS to get back to volte & then other rom.
Not sure y though. I was flashing latest firmware.

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Should work fine just make sure you chose lte/umts /gsm
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PapaDocta said:
Should work fine just make sure you chose lte/umts /gsm
Also Debloater works well regardless of the warning message.. You still can use it to block the sim activation wizard
Click to expand...
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i downgrade back to 4.4.4 but also no service :crying::crying::crying: the Debloater worked ,,, but no service i try global and gsm lte but no way ....
i get (Error while searching for networks)
Can you try another sim card by different operator... My phone works pretty much everywhere and never been activated in verizon
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Hello, Volte used to work well on my op9 pro recently updated to A12, I tied switching my sim card from sim 1 to sim 2 as I read some users were able to connect to 5g that way, well, it didn't work and when I switched my sim back, volte stopped working, tried restarting the phone a couple of times, no luck. Any ideas ?
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Can you try to reset your APNs and/or the whole networking? (Beware: by resetting the network you'll loose your saved WiFi configurations.)
MaUop3 said:
Can you try to reset your APNs and/or the whole networking? (Beware: by resetting the network you'll loose your saved WiFi configurations.)
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I just tried that, didn't work unfortunately, no volte or 5g, I only get 4g+ and my sim supports 5g on other devices :/ I can live with 4g, but I need volte to work
Mardds said:
I just tried that, didn't work unfortunately, no volte or 5g, I only get 4g+ and my sim supports 5g on other devices :/ I can live with 4g, but I need volte to work
Click to expand...
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I was getting the same issue, but flashing a different variant of your current c.44 should do the trick.
Ex: I have a LE2127 (TMO), I converted with a11 to use LE2123(EU) software updates. When android 12 hit my phone wouldn't give me data on the 2123 update, so I had to download the LE2125(global/NA) update and flash using the the system update app that was so generously given in the following post:
Post in thread '[TMO] 9 PRO MODEM RETENTION' https://forum.xda-developers.com/t/tmo-9-pro-modem-retention.4292445/post-86328243
I don't know what software or model your phone is now, so I am NOT suggesting you switch if you are not already on 2123 or 2125. Those two are interchangeable without problem so it should be fine

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