Sim Toolkit App Uses. Launch the app, search for diagmonagent. You can't delete the app if your phone isn't rooted.
The sim toolkit app is the control center of the knowroaming sim sticker. Android all in one toolkit 2.0. Android‘s operating software, the sim toolkit is an app between the other apps.
See the stk feature list for the complete feature list.
It enables you to import or export and delete or add new phone number, send messages or make a call from this app, facilitate the management of information on the sim card by managing your contacts. Just remove stk.apk from /system/app directory Now checkmark the box next to the app. I hope my sim will help facilitate adequate and useful to users.