4) * # 9999 # or * # 6120 # version softa (not available on all models)

before you change something in the settings
To think well, if you can BACK THEN ALL OF PLACE
Particularly in paragraph 1
Change the name of the operator can not at all NOKIA models in the latest models, this feature is disabled by the manufacturer.
the only (almost), plus the service code * # 3001 # 12345 # This is an opportunity to recover forgotten passwords to activate the mobile.
And another plus - see the level of the received signal.
NOKIA 2110
Show EMEI number * # 06 #>
Show phone software version * # 9999 #> or 2110i * # 170602112302 #> or * # 682371158412125 #>
See the date of manufacture phone * # 3283 #>

3110
Show EMEI number * # 06 #>
Shows software version * # 3110 #>
Restores factory settings * # 7780 *>
The entrance to the special menu * # 92702689 #> Commands in a special menu:
6232 OK indicates the month and year
7332 OK indicates the last modification date in the program
7832 OK indicates the date of purchase (if entered)
37832 OK you can enter the date of sale MMYY ('re careful then you can not change)
9268 OK indicates the serial number (IMEI)

5110
To reduce electricity consumption can disable EFR (Enhanced Full Rate) # 3370 #>
To activate EFR * 3370 #>
To reduce the rate of battery discharge, and enable HR (Half Rate) * 4720 #> then turn off and back on the phone.
To enable HR # 4720 #>