Mio S20 - Page 22

20
2. The battery wears,and the
performance will be gradually
reduced after using a few years
Replace new battery
3. When couldn't get a signal,
phone will continue to launch to
look for the base station, which
will use a lot of battery, and
cause standby time short.
Move to area of good signals or
shutdown for the moment
No network service
1. The SIM card is invalid
Contact with network operators
2. Not in a service area
Check the network operator's
service area
3. Weak signal
Move to the window or choose
another service network
SIM card can't use
1. SIM card is damaged
Back to network operators for
inspecting
2.SIM card is not installed
properly.
To properly installed the SIM
card
3. SIM card contacts is not clean
wipe the contacts with a clean
cloth
Can't send SMS
Not open this service or no input
text message center number
contact with network operators,
and set the SMS center number
Can't call or can't
answer the phone
Call limit has set
Close call limit
PIN error
Input wrong PIN code three times
Contact with network operators