hi hope you can help.for the last week i have been having probs with vivaz pro. screen will go blank apart from a box with message saying insert sim card. i cannot switch phone off and have to remove battery.when i switch phone back on it says do you wish to continue in flight mode ?.this is happening 3/4 times a day have you any ideas or answers that could help i have tried sim in old phone with no problems .many thanks gaz
