YAKOYA S1 User Manual page 25

Poor calling
quality
Short standby
time
SIM card error
Unable to dial
out
Caller unable
to contact you
- 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 cannot 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.
- 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.
- 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.
- 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.
- Please confirm whether the call barring function has
been activated.
- Please confirm whether the fixed calling function has
been activated.
- Please check whether you have connected your mobile
to the network.
- Please confirm whether you have paid the telephone bill.
- Please confirm whether the SIM card is valid.
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