This is a DualSim Manager expecially designed for HTC Devices (M8) with HTC Telephony API, will not work on other models.App will turn on DATA connection on the preferred SIM if you have signalsql_injectionSIM is not in RoamingApp will turn off DATA connection on the preferred SIM if no signalsql_injectionRoaming.App can also set the default SIM for data connection to the SIM not in roaming.If you need to change daily the preferred SIM to stay online this App is a MUST.Be sure to have a DATA Plan active on the default SIM! App will turn ON data connection if network is available, so operator charges will occur.