My mobile phone is connected to my home wifi yet i've been billed for data usage. I was told this may happen when the signal is weak. Can i be notified at the time so i can choose not to be billed?
Deactivating Data network mode can assure you that you are really just connected to Wi-Fi and not mistakenly to data.
To deactivate data connection press and hold the power button until a menu appears. Scroll down and choose Data network mode. This should deactivate data connection. If you want to use data again you just need to do the same steps again.