Since August 13, every time I call someone it says call failed. I have the blackberry curve and I have 4 bars all the time where ever I go. Why is this happeneing ?

There is many reason this could be happending one thing I would check is your sim card if your provider uses sim card. You should test your sim card in another working cell phone a friend or family member with the same provider if you get the same message call failed then you know it's a sim card problem. If the sim card works in you friends phone then it could be a problem with your phone blackberry has a good webiste once /at there site you click on support you should call your provider they may be able to fix it for free if still under warranty if it is an equipment problem under a year and no physical or liquid damage here is the web address hope this helps by the way sometimes just doing a soft reset by taking out the battery with the phone on but sometimes by doing a soft reset can loose setting or data not stored to sim card good luck BlackBerry - PDAs - BlackBerry Support at BlackBerry.com (http://na.blackberry.com/eng/support/)