Samsung GT-S5660L User Manual page 30

You select a contact to call, but the call is not dialled.
 Ensure that the correct number is stored in the contact list.
 Re-enter and save the number, if necessary.
The battery does not charge properly or sometimes the phone turns itself off.
 The battery terminals may be dirty. Wipe both gold-coloured contacts with a clean,
soft cloth and try charging the battery again.
 If the battery will no longer charge completely, dispose of the old battery properly
and replace it with a new battery.
Your phone is hot to the touch.
When you use several applications at once, your phone requires more power and may
heat up.
This is normal and should not affect your phone's lifespan or performance.