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Enter PIN. You have selected the option of entering PIN for each start of the
mobile phone, and so you must enter the PIN code (When the mobile phone is
first used, the PIN code on the SIM card must be entered).
Enter the PUK code. Wrong inputting of the PIN code will lock up your mobile
phone, and you should use the PUK code provided by the network operator to
launch it again.
Poor calling quality
Please check whether the volume has been adjusted appropriately.
The mobile phone is used in the place with poor signals, such as near a high-rise
building or in a basement, where radio waves can not effectively reach.
The mobile phone is used in peak hours, for example, the time to go to and leave
work, and line congestion makes it impossible to call.
Short standby time
The standby time is related to the system settings of the network, and the mobile
phone is possibly in an area with poor signals. When it fails to receive signals,
the mobile phone will continuously transmit to look for a base station, thereby
consuming a lot of battery power and leading to a shorter standby time. Please
move to a place with strong signals or shut down the mobile phone for a
moment.
Replacing a new battery is needed.
SIM card error
The metal surface of the SIM card is contaminated. Please clean the metal
contact of the SIM card with clean cloth.
The SIM card has not been inserted correctly.
Damaged SIM card. Please contact your network operator.
Unable to dial out
Please confirm whether you have pressed the dial key after dialing a number.
Please confirm whether you have paid the telephone bill.
Please confirm whether the SIM card is valid.
47


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Others manual(s) of ITT Dual 77

ITT Dual 77 User Manual - German - 53 pages

ITT Dual 77 User Manual - Dutch - 50 pages

ITT Dual 77 User Manual - French - 57 pages

ITT Dual 77 User Manual - Italian - 56 pages

ITT Dual 77 User Manual - Spanish - 53 pages


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