AT&T Z431 User Manual page 35

Problem Possible Causes
Battery will The battery or battery charger
not charge is damaged.
The phone's temperature is
below 32°F (0°C) or higher
than 113°F (45°C).
Poor contact between the
battery and charger.
Unusually Certain phone functions
short battery consume additional battery
life power, such as Bluetooth and
HAC mode.
Weak network signal.
Phone will not Battery is depleted.
turn on
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Possible Solution
Contact the dealer where you
purchased the equipment.
1. Move the battery to an
environment where the
temperature is within
operating range.
2. Allow time for the battery's
temperature to return to
normal before attempting
to charge again.
Check and clean all
connectors to ensure good
contact.
Disable Bluetooth and/or HAC
mode if you are not using
these functions.
Turn off the phone until you
reach an area with a strong
network signal.
Charge the battery.
Troubleshooting and FAQs
Problem Possible Causes
SIM card error SIM card is damaged or
defective.
SIM card inserted improperly.
Dirt or debris on the SIM card
contacts.
PIN code is You have entered an incorrect
blocked PIN code ten consecutive
times.
Unable to enter The Address Book's memory
information is already full.
into the
Address Book
Troubleshooting and FAQs
Possible Solution
Take the SIM card to a service
center for testing.
Check to ensure that the
SIM card is facing the right
direction and that it is fully
inserted into the slot.
Use a soft, dry cloth to clean
the SIM card contacts.
If you have the SIM card's
PUK code, use the PUK code
to unlock the SIM card.
If you do not have the PUK
code, contact your service
provider.
Delete unneeded data from
the Address Book.
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