One of the biggest advantages of rooting your Android device is to be enable to override your baseband. This allows you to choose which baseband provide you with the best connection and coverage.
However in flashing baseband you have to ensure that the phone is using the RIL (Radio Interface Layer) that matches your baseband. GetRIL is the tool to make this task easier. As the application’s description suggested
GetRIL shows the device’s current RIL (Radio Interface Layer) and baseband, notifying you if they match or not. If not – and you’re on a rooted device – you’ll be able to download and install a new matching RIL.