User guide

135DT412/DT422/DT432
Troubleshooting
Check SIM card
The SIM card is
missing or inserted
the wrong way.
Insert or adjust the
SIM card or
contact system
administrator.
Keys locked
Unlock
The key pad is
locked.
Press Menu key
followed by
*.
No System
Cannot connect to
the network, the
phone is not
registered or out of
range.
Contact system
administrator.
Fault / Display Probable cause Action or
comment