Forum Discussion

Ged_1388391's avatar
Ged_1388391
SMARTY Maverick
08-04-2025

4g calling/volte on Smarty's blacklisted phone (Sony Xperia XZ2 Compact)

I'm usig Sony Xperia XZ2 Compact (last 5 inch android from Sony) and i think i solved (or it solved itself) the 4g-Volte problem on it. Sony XZ2 phone is on Volte support blacklist at Smarty, so 4g calling should not work, but i didnt want to give up that easy. Before and after "3g switch off" all my calls switched to 3g(H, H+) doesnt matter that internet ran on 4g. So i installed LineageOS, fully rooted the phone, and noticed that Smarty Sim doesn't get network modem configuration, in fact Smarty modem configuration folder doesn't exist at all in this phone. So by using "Root Explorer" app i had to create "S21.4" folder inside "root/vendor/modemconf/" ,then inside it create a file named "modem.conf" which contains "mcfg_sw/generic/euro/hutch/vlvw/uk/mcfg_sw.mbn" line. (Btw i recommended to take sim off or switch to airplane mode before doing this). Restarted the phone and now i can make and receive HD calls, Volte still not showing in the menus, but my calls don't drop to 3g anymore. Data, SMS also works.

3G Switch Off
Call Issues
Network

4 Replies

  • MSF's avatar
    MSF
    SMARTY Guru
    08-04-2025

    Ged_1388391  The certainly sounds like good news for you.

    Realistically though, how many people do you think will have the technical understanding to adjust their phones in the same way?

    • Ged_1388391's avatar
      Ged_1388391
      SMARTY Maverick
      08-04-2025

      Yeah its a bit complicated, especially for casual user. Actually i was about to leave Smarty, already found another provider where i would port my number to, but looks like im about to stay :). I really didnt want to buy new phone as mine is the last compact 5 inch android (which wont break my pocket) with volte support, i like small phones, its a shame they dont make those anymore.

      • MSF's avatar
        MSF
        SMARTY Guru
        08-04-2025

        Ged_1388391 Absolutely see your point. Great that you seem to have been able to sort it.

        I used to use an iPhone mini 12 but with erm...advancing years....I seem to find that the screen has shrunk....because I naturally still have perfect eyesight!

  • SmartyTrousers's avatar
    SmartyTrousers
    SMARTY Centurion
    08-04-2025

    Ged_1388391 Nice job. To be clear, Smarty don't blacklist any particular models of phone, the issue is that particular models of phone don't have the relevent configuration details to work correctly with Smarty's VoLTE. What you have done is installed an OS that has that relevent configuration details (presumably alongside configuration details for many other networks) and you've set the phone to use that specific configuration.

    Well done again. And I completely understand you wanting to hold onto your small phone.. it'll be a sad day when I have to let my iPhone 12 Mini go! 👊