How to Disable Making Calls When Device is Locked (Bluetooth Headset is Connected)
When you have a Bluetooth headset connected to your Android device, making calls is allowed by default even if the phone is locked. To disable making ...Continue
Using the data connection network of your Android phone while roaming may result in additional charges. To deactivate and disable data roaming on HTC One do as follows:
1. Open "Settings" App
2. Tap "Mobile Data"
3. Make sure "Data Roaming" is unmarked (To enable data while roaming, mark the option)
4. You can also mark "Data Roaming Sound" to be notified when connecting to roaming network