If I type a character like “,” and press on the call button , I get the error dialog “Connection problem or invalid mmi code”. Can someone tell me from where this dialog pop up comes in Android.
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If I type a character like “,” and press on the call button , I get the error dialog “Connection problem or invalid mmi code”. Can someone tell me from where this dialog pop up comes in Android.
The particular string you mention comes from the framework resources in frameworks/base/core/res/res/values/strings.xml for the ‘mmiError’ resource. The region you are probably interested in looking at is the internal telephony code in frameworks/base/telephony/java/com/android/internal/telephony/gsm/GsmMmiCode.java
You can find this kind of thing using ‘git grep’ and suitable regular expressions.
I should add that this ends up back at the dialer application (packages/apps/Phone). If you have a look at PhoneUtils.java in that package there is a displayMMIComplete function that deals with the user display end of things.