VoLTE APN settings for T-Mobile's MVNOs SIM cards with MNC 240 (as of December 31 2022)

 If you have SIM card of one of T-Mobile's MVNO with MNC 240 (Lycamobile, Freedompop, Ultramobile, Tello etc.) and VoLTE does not work on your phone, try this:


Add new ims endpoint with following parameters:

Name: ims
APN: ims
APN type: ims
MCC: 310
MNC: 240 (or 260 if your SIM's MNC is 260, but MNC 260 SIMs usually do not have VoLTE issue)
Protocol: IPv6
Roaming Protocol: IPv4
Bearer: LTE, IWLAN (or just LTE if you cannot add IWLAN )

Last line (Bearer) is very important: it is a key to VoLTE. You should set it at least to LTE to enable VoLTE. Second value IWLAN seems to be responsible for VoWIFI, but I couldn't enable Wi-Fi calling even after adding IWLAN to Bearer.

Just create this APN but do not set it active.


After setting
Bearer: LTE

VoLTE started to work with Freedompop/Tmobile SIM and Tello SIM (both MNC 240) on my old Blu R1 HD (Android 6) and Tracfone's unlocked (and T-Mobile compatible) Samsung A10E.

Tello support page is not mentioning Bearer attribute and in my case VoLTE did not work without it.

Some phones (especially dumbphones and some old phones) do not have attribute Bearer. In this case you may not be able to activate VoLTE but at least you can try.

Some phones do not allow adding secondary APN (Microsoft Lumia/ Windows Phone). In this case nothing can be done.

https://www.howardforums.com/showthread.php/1927383-VoLTE-APN-settings-for-T-Mobile-s-MVNOs-SIM-cards-with-MNC-240?p=17239159#post17239159

https://telegra.ph/VoLTE-APN-settings-for-T-Mobiles-MVNOs-SIM-cards-with-MNC-240-02-02

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