E28 E2831, User Manual

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SIM card doesn’t work.
Check whether the SIM card is damaged by your
network service provider.
Owe or pre-paid has
expired or been used out
Contact your network service provider and
recharge it.
Signal is too weak or
there is no signal.
Network coverage is not enough or network fails.
Move to a wide area and retry.
The network is set
incorrectly
Contact your network operator to get correct
settings.
The data service is not
run.
Apply for GPRS service from your network
operator.
Network fails to provide
data service.
Confirm it from your network operator.
SIM card is not inserted Insert a valid SIM card.
Poor SIM card contacts
Take out the SIM card and clean the dirt in the
contact point, and then reinstall it.
Use an outdated 5V SIM
card.
Only an up-to-date 3V SIM card can be used.
SIM card does not work.
Check whether the SIM card is damaged by your
network service provider.
Owe or pre-paid has
expired or been used out
Contact your network service provider and
recharge it.
Cannot access
network.
Signal is too weak or
there is no signal.
Network coverage is not enough or network fails.
Move to a wide area and retry.
Fierce vibration
It may cause this
phenomenon if the
battery is recharged
when it is nearly
depleted.
Pull out the charger and take out the battery,
reinstall the battery and replace with a backup
battery and retry. Do not take out the battery with
the charger plugged in. Do not disassemble the
mobile phone by yourself.
Mobile phone
wets
Rain, sweating or damp
environment
Take out the battery and SIM card, wipe up the
mobile phone with a dry soft cloth, put it in a dry
ventilate place, and then replace the SIM card
and battery. If it still does not work or works
unstably, contact the Maintenance contractor. Do