Most custom ROMs have problems with Stk.apk (the SIM toolkit part of Android) not functioning properly. The question is not the missing application (running Oxygen, I have the app but it is not working), but something systematic (dependency on RIL?).

I'd like to know why so, and what can be made about it?

  • I would have tagged the post with "stk" if I could...
    – martin
    Commented Oct 17, 2011 at 11:16
  • 1
    I would name the new tag (if I could) "sim-toolkit" - this one is used at Stackoverflow. BTW: On my Desire (InsertCoin CM7/STOCK 1.1.2) STK seems to work.
    – Robert
    Commented Oct 17, 2011 at 11:44
  • After reading up on this, it seems that Android itself has extremely limited support for this, so it's a case of kicking Google into supporting this Commented Oct 17, 2011 at 14:48

1 Answer 1


Well, the SIM toolkit is initialized in 2 modes, dedicated mode and raw mode. SIM toolkit also depends on the modem you are using. If the modem does not support the dedicated mode, you won't be able to see the SIM toolkit in your UI as it sends raw data to the upper layer (URCs) in raw mode.

  • In short: because the custom ROM hasn't bothered to implement the necessary part of the operating system.
    – Ken Sharp
    Commented Dec 18, 2015 at 23:05

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