How can I stop the iphone 4 screen from dimming when using a satnav application? I have OS 4.3.2. In settings, the only options I have are a brightness slider and an auto brightness on/off button. Setting the screen on full brightness and the auto setting off makes no difference.
Once the screen as dimmed, I cannot get it back to full brightness without switching it off and back on. Not a good idea when driving!
On my old 3Gs, I never had a problem that I can remember.
Thanks
