Charging is not supported with this accessory and Lock Screen (Apple iPhone 3GS)?

My lock screen says "Charging is not supported with this accessory" and a Yellow caution sign. And you can't change your lock screen to anything different. It stays like this. Help? I will reset if i have to and make it factory mode.

Are you using an accessory that is made to be used with apple? If not then throw away the one your using to charge your phone and get one that is made to work for Apple. Like one made by Apple, Belkin.

I had this happen and my chord was bad. I bought a new one on amazon and it fixed it. Try your car charger to see if the chord is bad.

Chances are your cord is bad. This can also happen if using (some) non-Apple chargers.