Oneplus 5 : enable VoLTE for Rakuten Mobile Japan Un Limit plan

VoLTE on Oneplus 5 Android 10 OxygenOS 10.0.1 (for Rakuten Mobile)

Rakuten Mobile Un-Limit plan is an LTE-Only service on band 3 (and band 18 for the partner AU mobile). Oneplus 5 needs to be set as LTE only to get signal.

• *#*#4636#*#* -> Phone information -> Set preferred network type=LTE Only

Introduction for non-rooted and locked bootloader

The opening thread post https://forum.xda-developers.com/t/guide-volte-vowifi-working-for-german-carriers.3817542/ works for all the OxygenOS versions included 9.0.11.

• Using India-VoLTE-Vodafone for Sub0 and Sub1 (Sim 1 & 2) is enough to enable VoLTE on Oneplus 5.
• After 9.0.11 (or upgrade to 10.0.x), QPST/PDC doesn't work anymore with an error message.
  • This can be used: https://forum.xda-developers.com/t/guide-volte-vowifi-working-for-german-carriers.3817542/page-68#post-82861349 or https://forums.oneplus.com/threads/enable-vowifi-and-volte-after-update-oneplus-5t-to-android-10.1252067/

For rooted devices, there are other solutions such as (TIM Brasil 1+5 android 10): https://forum.xda-developers.com/oneplus-5/how-to/activation-volte-vowifi-tim-brasil-t4127779

• Get the VoLTE switch (OEMLOGKIT) - [OOS 10 : VoLTE switch is gone from *#800# - function switch menu]
  • https://forum.xda-developers.com/oneplus-6/help/oos-10-volte-switch-gone-800-function-t4000461
  • dial *#800# -> Function Switch -> Enable VoLTE -> Reboot -> SIM & Network/Enhanced communications VolTE switch is available.

Extras

• 1+5T:

• https://forum.xda-developers.com/oneplus-5t/how-to/guide-volte-vowifi-german-carriers-t3817542/post82769961#post82769961

• Old 日本語 2018 PDC/QPST

  • https://gadget.hrksv.com/2018/12/01/post-16307

Root and unlock bootloader with TWRP, Magisk, Nandroid, EFS

• https://forum.xda-developers.com/oneplus-5/how-to/oneplus-5-unlock-bootloader-flash-twrp-t3624877