Telstra T84 User Manual page 63

Symptom
My data usage is
excessive
ERROR MESSAGES
Message
No SIM Card
Enter PIN code
Enter PUK code
Enter Unlock Code
Solution
Check Settings > Data usage to determine
which apps are consuming your data. Google+
can use large amounts of backup data. Review
under Google+ > Options > Settings
Solution
Check a valid SIM card is inserted.
See the Getting Started section
You have set a SIM PIN. Please enter your SIM
PIN code.
Contact your Service Provider to get the PUK
code
Contact your Service Provider to obtain the
network unlocking code.
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